Greatly reduce GCC build logs

src/ci/docker/host-x86_64/dist-x86_64-linux/build-gccjit.sh

@@ -14,15 +14,19 @@ mkdir ../gcc-build ../gcc-install
 cd ../gcc-build
 
 # Building GCC.
+# We redirect all stdout because the GCC build scripts generate thousands of lines
+# of output. Unfortunately, even when using `--quiet` option for all commands,
+# the output still thousands of lines of output, forcing us to use this solution.
 ../gcc-src/configure \
     --enable-host-shared \
     --enable-languages=jit \
     --enable-checking=release \
     --disable-bootstrap \
     --disable-multilib \
-    --prefix=$(pwd)/../gcc-install
-make
-make install
+    --prefix=$(pwd)/../gcc-install > /dev/null
+
+make > /dev/null
+make install > /dev/null
 
 rm -rf ../gcc-src
 ln -s /scripts/gcc-install/lib/libgccjit.so /usr/lib/x86_64-linux-gnu/libgccjit.so