WiP: have modules built to be optimized for space (-Os)

Adresses @easrentai suggestion to pass modules build optimization for space here: linuxboot#590 (comment)

Unifying passage of $(CROSS_TOOLS) as environment variable to compare with linuxboot#1121

Limitations:
- busybox don't seem to take Os into consideration when applied, no change to module yet.
- kexec applies both O2 and Os, no change to module yet.
- Kernel is already optimized for size (CONFIG_CC_OPTIMIZE_FOR_SIZE as Kconfig option), and kernel modules stripped prior of inserted in initrd, compressed with xz. Nothing else can be done here unless lto

Next steps:
- Go LTO for kernel and modules? But, I was not successful going that way in the past, maybe musl-cross-make has changed.
- Not sure if I read correctly, but -Oz may have happened under GCC 12.1, but not sure if apple relative or FSS GCC. Opened an issue over musl-cross-make, but the project is conservative on used GCC version.

Attempt to contribute to linuxboot#590 by reducing payload's footprint

modules/cairo

@@ -7,8 +7,8 @@ cairo_url := https://www.cairographics.org/releases/$(cairo_tar)
 cairo_hash := 8c90f00c500b2299c0a323dd9beead2a00353752b2092ead558139bd67f7bf16
 
 cairo_configure := \
+	CFLAGS="-DCAIRO_NO_MUTEX=1 -Os"  \
 	$(CROSS_TOOLS) \
-	CFLAGS="-DCAIRO_NO_MUTEX=1 -O3"  \
 	./configure \
 	--host $(MUSL_ARCH)-elf-linux \
 	--prefix="/" \

modules/cryptsetup

@@ -10,8 +10,10 @@ cryptsetup_hash := af2b04e8475cf40b8d9ffd97a1acfa73aa787c890430afd89804fb544d6ad
 
 # Use an empty prefix so that the executables will not include the
 # build path.
-cryptsetup_configure := ./configure \
+cryptsetup_configure := \
 	$(CROSS_TOOLS) \
+	CFLAGS="-Os" \
+	./configure \
 	--host $(MUSL_ARCH)-elf-linux \
 	--prefix "/" \
 	--disable-gcrypt-pbkdf2 \

modules/cryptsetup2

@@ -10,8 +10,10 @@ cryptsetup2_hash := 3bca4ffe39e2f94cef50f6ea65acb873a6dbce5db34fc6bcefe38b6d095e
 
 # Use an empty prefix so that the executables will not include the
 # build path.
-cryptsetup2_configure := ./configure \
+cryptsetup2_configure := \
 	$(CROSS_TOOLS) \
+	CFLAGS="-Os" \
+	./configure \
 	--host $(MUSL_ARCH)-elf-linux \
 	--prefix "/" \
 	--disable-rpath \

modules/gpg

@@ -17,8 +17,10 @@ gpg_hash := 6b47a3100c857dcab3c60e6152e56a997f2c7862c1b8b2b25adf3884a1ae2276
 # Force a different host/build setting so that it detects a cross compile.
 # Otherwise it wil try to run tests.
 #
-gpg_configure := ./configure \
+gpg_configure := \
+	CFLAGS="-Os"  \
 	$(CROSS_TOOLS) \
+	./configure \
 	--build $(MUSL_ARCH)-elf-linux \
 	--host $(MUSL_ARCH)-linux-musl \
 	--with-libusb="$(INSTALL)" \

modules/gpg2

@@ -11,8 +11,10 @@ gpg2_hash := 61e83278fb5fa7336658a8b73ab26f379d41275bb1c7c6e694dd9f9a6e8e76ec
 # be generated with the correct paths, but then re-write them when
 # we use the install target so that they will be copied to the correct
 # location.
-gpg2_configure := ./configure \
+gpg2_configure := \
 	$(CROSS_TOOLS) \
+	CFLAGS="-Os"  \
+	./configure \
 	CPPFLAGS="-I$(INSTALL)/include/libusb-1.0" \
 	--host $(MUSL_ARCH)-linux-musl \
 	--with-libusb="$(INSTALL)" \

modules/libassuan

@@ -6,8 +6,10 @@ libassuan_tar := libassuan-$(libassuan_version).tar.bz2
 libassuan_url := https://gnupg.org/ftp/gcrypt/libassuan/$(libassuan_tar)
 libassuan_hash := 91bcb0403866b4e7c4bc1cc52ed4c364a9b5414b3994f718c70303f7f765e702
 
-libassuan_configure := ./configure \
+libassuan_configure := \
+	CFLAGS="-Os" \
 	$(CROSS_TOOLS) \
+	./configure \
 	--host $(MUSL_ARCH)-linux-musl \
 	--prefix "/" \
 	--disable-static \

modules/libgcrypt

@@ -6,8 +6,10 @@ libgcrypt_tar := libgcrypt-$(libgcrypt_version).tar.bz2
 libgcrypt_url := https://gnupg.org/ftp/gcrypt/libgcrypt/$(libgcrypt_tar)
 libgcrypt_hash := 0cba2700617b99fc33864a0c16b1fa7fdf9781d9ed3509f5d767178e5fd7b975
 
-libgcrypt_configure := ./configure \
+libgcrypt_configure := \
 	$(CROSS_TOOLS) \
+	CFLAGS="-Os"  \
+	./configure \
 	--host=$(MUSL_ARCH)-linux-musl \
 	--prefix "/" \
 	--disable-static \

modules/libgpg-error

@@ -6,8 +6,10 @@ libgpg-error_tar := libgpg-error-$(libgpg-error_version).tar.bz2
 libgpg-error_url := https://gnupg.org/ftp/gcrypt/libgpg-error/$(libgpg-error_tar)
 libgpg-error_hash := b32d6ff72a73cf79797f7f2d039e95e9c6f92f0c1450215410840ab62aea9763
 
-libgpg-error_configure := ./configure \
+libgpg-error_configure := \
 	$(CROSS_TOOLS) \
+	CFLAGS="-Os"  \
+	./configure \
 	--prefix "/" \
 	--host=$(MUSL_ARCH)-linux-musl \
 	--disable-static \

modules/libksba

@@ -6,8 +6,10 @@ libksba_tar := libksba-$(libksba_version).tar.bz2
 libksba_url := https://gnupg.org/ftp/gcrypt/libksba/$(libksba_tar)
 libksba_hash := bfe6a8e91ff0f54d8a329514db406667000cb207238eded49b599761bfca41b6
 
-libksba_configure := ./configure \
+libksba_configure := \
 	$(CROSS_TOOLS) \
+	CFLAGS="-Os" \
+	./configure \
 	--host $(MUSL_ARCH)-linux-musl \
 	--prefix "/" \
 	--disable-static \

modules/libpng

@@ -8,6 +8,7 @@ libpng_hash := 574623a4901a9969080ab4a2df9437026c8a87150dfd5c235e28c94b212964a7
 
 libpng_configure := \
 	$(CROSS_TOOLS) \
+	CFLAGS="-Os" \
 	./configure \
 	--host $(MUSL_ARCH)-elf-linux \
 	--prefix="/" \

modules/lvm2

@@ -10,6 +10,7 @@ lvm2_hash := 23a3d1cddd41b3ef51812ebf83e9fa491f502fe74130d4263be327a91914660d
 # so we force it via the configure cache.
 lvm2_configure := \
 	$(CROSS_TOOLS) \
+	CFLAGS="-Os"  \
 	PKG_CONFIG=/bin/false \
 	MODPROBE_CMD=/bin/false \
 	ac_cv_func_malloc_0_nonnull=yes \

modules/mbedtls

@@ -12,6 +12,7 @@ mbedtls_configure :=
 
 mbedtls_target := \
 	SHARED=1 \
+	CFLAGS="-Os"  \
 	DESTDIR=$(INSTALL) \
 	$(CROSS_TOOLS) \
 	$(MAKE_JOBS) \

modules/pinentry

@@ -13,8 +13,10 @@ pinentry_hash := 68076686fa724a290ea49cdf0d1c0c1500907d1b759a3bcbfbec0293e8f5657
 # be generated with the correct paths, but then re-write them when
 # we use the install target so that they will be copied to the correct
 # location.
-pinentry_configure := ./configure \
+pinentry_configure := \
 	$(CROSS_TOOLS) \
+	CFLAGS="-Os" \
+	./configure \
 	--host $(MUSL_ARCH)-linux-musl \
 	--prefix "/" \
 	--enable-pinentry-tty \

modules/pixman

@@ -8,6 +8,7 @@ pixman_hash := 21b6b249b51c6800dc9553b65106e1e37d0e25df942c90531d4c3997aa20a88e
 
 pixman_configure := \
 	$(CROSS_TOOLS) \
+	CFLAGS="-Os"  \
 	./configure \
 	--host $(MUSL_ARCH)-elf-linux \
 	--prefix="/" \

modules/tpmtotp

@@ -13,7 +13,7 @@ tpmtotp_hash := 1082f2b0e4af833e04220dddedcc21a39eb39ee4dc5668bb010e7bcc795c606c
 
 tpmtotp_target := \
 	$(CROSS_TOOLS) \
-	CFLAGS="-I$(INSTALL)/include" \
+	CFLAGS="-I$(INSTALL)/include -Os" \
 	LDFLAGS="-L$(INSTALL)/lib" \
 
 tpmtotp_output := \

modules/util-linux

@@ -6,8 +6,10 @@ util-linux_tar := util-linux-$(util-linux_version).tar.xz
 util-linux_url := https://www.kernel.org/pub/linux/utils/util-linux/v2.29/$(util-linux_tar)
 util-linux_hash := accea4d678209f97f634f40a93b7e9fcad5915d1f4749f6c47bee6bf110fe8e3
 
-util-linux_configure := ./configure \
+util-linux_configure := \
 	$(CROSS_TOOLS) \
+	CFLAGS="-Os"  \
+	./configure \
 	--host $(MUSL_ARCH)-elf-linux \
 	--prefix "/" \
 	--oldincludedir "$(INSTALL)/include" \

modules/zlib

@@ -9,6 +9,7 @@ zlib_hash := c3e5e9fdd5004dcb542feda5ee4f0ff0744628baf8ed2dd5d66f8ca1197cb1a1
 
 zlib_configure := \
 	$(CROSS_TOOLS) \
+	CFLAGS="-Os" \
 	./configure \
 	--prefix="/" \