wmmenugen: Add file name validator function

Add optional interface parsers may choose to implement that, when
a directory is being scanned for files to parse, may, based on
the file name, decide whether or not said file should be parsed.

Signed-off-by: Tamas TEVESZ <ice@extreme.hu>

util/wmmenugen_parse_xdg.c

@@ -34,7 +34,17 @@
  * Basic validation of the .desktop file is done.
  */
 
+#if __GLIBC__ && \
+    (_XOPEN_SOURCE && _XOPEN_SOURCE < 500) || \
+    !_XOPEN_SOURCE
+#define _XOPEN_SOURCE 500		/* nftw */
+#endif
+
+#include <sys/types.h>
+#include <sys/stat.h>
+
 #include <ctype.h>
+#include <ftw.h>
 #if DEBUG
 #include <errno.h>
 #endif