buildrepo: only consider rebuilding packages that has proper arch set

buildrepo.in

@@ -47,6 +47,16 @@ all_exist() {
 	return 0
 }
 
+is_in() {
+	local needle="$1"
+	shift
+	while [ $# -gt 0 ]; do
+		[ "$needle" = "$1" ] && return 0
+		shift
+	done
+	return 1
+}
+
 list_needbuild() {
 	local repo="$1" i=
 
@@ -63,8 +73,13 @@ list_needbuild() {
 		pkgver=
 		pkgrel=
 		subpackages=
+		arch=
 		. ./APKBUILD
 
+		if ! is_in all $arch && ! is_in $CARCH $arch; then
+			continue
+		fi
+
 		pkgs=
 		for subpkg in $pkgname $subpackages; do
 			pkgfile=${subpkg%:*}-$pkgver-r$pkgrel.apk