Fix .SRCINFO output with architecture specific fields

Do not merge the architecture specific fields when creating a .SRCINFO file.

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

scripts/makepkg.sh.in

@@ -1621,7 +1621,10 @@ merge_arch_attrs() {
 
 source_buildfile() {
 	source_safe "$@"
-	merge_arch_attrs
+
+	if (( !SOURCEONLY )); then
+		merge_arch_attrs
+	fi
 }
 
 run_function_safe() {
@@ -2136,8 +2139,6 @@ write_pkginfo() {
 	local size="$(@DUPATH@ @DUFLAGS@)"
 	size="$(( ${size%%[^0-9]*} * 1024 ))"
 
-	merge_arch_attrs
-
 	msg2 "$(gettext "Generating %s file...")" ".PKGINFO"
 	printf "# Generated by makepkg %s\n" "$makepkg_version"
 	printf "# using %s\n" "$(fakeroot -v)"