build-mingw-w64: Use silent rules for compiling things

This reduces the amount of log output significantly.

For the linux build on github actions, this reduces the log output
from 8.5 MB down to 4.7 MB.

build-mingw-w64.sh

@@ -132,6 +132,7 @@ for arch in $ARCHS; do
         ;;
     esac
     FLAGS="$FLAGS --with-default-msvcrt=$DEFAULT_MSVCRT"
+    FLAGS="$FLAGS --enable-silent-rules"
     ../configure --host=$arch-w64-mingw32 --prefix="$PREFIX/$arch-w64-mingw32" $FLAGS $CFGUARD_FLAGS $CRT_CONFIG_FLAGS
     $MAKE -j$CORES
     $MAKE install