abuild: fix regression in scanning shared objects

fix regression introduced with commit c70dbf84 (abuild: automatically
detect symlink targets in other subpackages)

abuild.in

@@ -1061,7 +1061,7 @@ scan_shared_objects() {
 	local name="$1" controldir="$2" datadir="$3"
 	local opt= i=
 
-	if [ "$arch" != "noarch" ]; then
+	if [ "$arch" = "noarch" ]; then
 		return 0
 	fi