please.sh: work around msys2-runtime failure during parallel build

For some reason, it seems that the parallel build of the MSYS2 runtime
is currently broken (it complains about missing files). Locally the
build succeeds when passing `-j1`, so let's try that.

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

please.sh

@@ -737,8 +737,10 @@ pkg_build () {
 		;;
 	MSYS)
 		require msys2-devel binutils
+		opt_j=-j5
 		if test msys2-runtime = "$package"
 		then
+			opt_j=-j1
 			require mingw-w64-cross-crt-git mingw-w64-cross-gcc
 			test ! -d msys2-runtime ||
 			git -C msys2-runtime fetch ||
@@ -775,7 +777,7 @@ pkg_build () {
 			 export PATH=/usr/bin:/opt/bin:$PATH &&
 			 unset ORIGINAL_PATH &&
 			 . /etc/profile &&
-			 MAKEFLAGS=-j5 makepkg -s --noconfirm \
+			 MAKEFLAGS='"$opt_j"' makepkg -s --noconfirm \
 				'"$extra_makepkg_opts"' &&
 			 makepkg --allsource '"$extra_makepkg_opts" ||
 		die "%s: could not build\n" "$sdk$pkgpath"