Add common/match.c with match_glob() from theme.c

...and make it fully case-insensitive in preparation for window-rules.

src/common/match.c

@@ -0,0 +1,12 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#define _POSIX_C_SOURCE 200809L
+#include <glib.h>
+#include <stdbool.h>
+#include "common/match.h"
+
+bool
+match_glob(const gchar *pattern, const gchar *string)
+{
+	return g_pattern_match_simple(g_utf8_casefold(pattern, -1), g_utf8_casefold(string, -1));
+}
+

src/common/meson.build

@@ -5,6 +5,7 @@ labwc_sources += files(
   'font.c',
   'grab-file.c',
   'graphic-helpers.c',
+  'match.c',
   'mem.c',
   'nodename.c',
   'parse-bool.c',