abuild: create $arch and noarch dirs for abuildrepo

abuild.in

@@ -796,7 +796,7 @@ clean_abuildrepo() {
 
 mklinks_abuildrepo() {
 	local apk
-	mkdir -p "$abuildrepo"
+	mkdir -p "$abuildrepo"/$CARCH "$abuildrepo"/noarch
 	cd "$abuildrepo" || return 1
 	# create links for this package
 	for apk in $(listpkg); do