lock MENU_COLOR_REGEX away since it isn't Win32 yet

include/config.h

@@ -437,8 +437,12 @@ typedef unsigned char	uchar;
  */
 
 /* Menucolors */
+/* HACK: this is being added to fix the builds temporarily.
+ * Remove it whenever we finally get a real regex for Win32 */
+#ifdef UNIX
 # define MENU_COLOR_REGEX  /* use GNU regex */
 /*# define MENU_COLOR_REGEX_POSIX*/ /* use POSIX regex */
+#endif
 /* if neither is defined, uses pmatch()
  * pmatch() provides basic globbing: '*' and '?' wildcards.
  */