metadep-expander: Made unified warning messages

bin/metadep-expander

@@ -11,7 +11,8 @@ metapkgs="$(grep -e @META "$f" | grep -v '^#')"
 for metapkg in $metapkgs; do
 	metapkg=${metapkg%@META}
 	if ! "$APT_CACHE" show "$metapkg" > /dev/null 2>&1; then
-		echo "Warning: Metapackage $metapkg not available!!!" >&2
+		echo "** warning: Metapackage '$metapkg' not available!!!" 1>&2
+		echo "** warning: '$metapkg' removed from $f" 1>&2
 		continue
 	fi
 	t="`mktemp`"