rust: set _bootstrapping=no for all architectures (not just aarch64)

when _bootstrapping=no, the rust build is configured to use the local rust for stage 0.
stage 0 will use the installed MSYS2 rust (must be the latest version...).

when _bootstrapping=yes, the build is configured to download and extract the previous rust version.
in this case, the official rust build will be used which kind of defeats the point (?)

mingw-w64-rust/PKGBUILD

@@ -4,15 +4,19 @@
 # Contributor: Philippe Renon <philippe_renon@yahoo.fr>
 
 _realname=rust
-_bootstrapping=yes
+# when _bootstrapping=no, the rust build is configured to use the local rust for stage 0
+# stage 0 will use the installed MSYS2 rust (hopefully the latest version...)
+# when _bootstrapping=yes, the build is configured to download and extract the previous rust version
+# in this case, the official rust build will be used which kind of defeats the point (?)
+_bootstrapping=no
 if [[ $MINGW_PACKAGE_PREFIX == *-clang-aarch64 ]]; then
   _bootstrapping=no
 fi
 pkgbase=mingw-w64-${_realname}
 pkgname=("${MINGW_PACKAGE_PREFIX}-${_realname}"
          "${MINGW_PACKAGE_PREFIX}-rust-docs")
 pkgver=1.69.0
-pkgrel=1
+pkgrel=2
 pkgdesc="Systems programming language focused on safety, speed and concurrency (mingw-w64)"
 arch=('any')
 mingw_arch=('mingw32' 'mingw64' 'ucrt64' 'clang64' 'clangarm64' 'clang32')