libmakepkg: ensure clearing of buildflags happens first

When 'options=('!buildflags') is used, we want to ensure our
buildflags are cleared first. Currently this happens due to luck
of alphabetical ordering, but this could change with libmakepkg
drop-ins.

Signed-off-by: Allan McRae <allan@archlinux.org>

scripts/libmakepkg/buildenv.sh.in

@@ -34,6 +34,9 @@ done
 readonly -a buildenv_functions buildenv_vars build_options
 
 prepare_buildenv() {
+	# ensure this function runs first
+	buildenv_buildflags
+
 	for func in ${buildenv_functions[@]}; do
 		$func
 	done

scripts/libmakepkg/buildenv/buildflags.sh.in

@@ -26,7 +26,6 @@ LIBRARY=${LIBRARY:-'@libmakepkgdir@'}
 source "$LIBRARY/util/option.sh"
 
 build_options+=('buildflags')
-buildenv_functions+=('buildenv_buildflags')
 
 buildenv_buildflags() {
 	if check_option "buildflags" "n"; then