Remove warnings

* Remove assigned but not used variables (GCC 4.6)
* Bump _XOPEN_SOURCE to 600, ridding of FreeBSD warnings (this probably need
  to be tweaked on a per-implementation basis as problems arise)

util/wmgenmenu.c

@@ -4,6 +4,7 @@
 #define _GNU_SOURCE		/* getopt_long */
 #endif
 
+#include <ctype.h>
 #include <getopt.h>
 #include <limits.h>
 #include <locale.h>