Include missing header to fix 64-bit issues.

--- gnu/getopt.c.orig	Sun Mar 15 22:22:03 2009
+++ gnu/getopt.c	Sun Mar 15 22:22:13 2009
@@ -31,6 +31,8 @@
 #include <config.h>
 #endif
 
+#include <string.h>
+
 #if !defined (__STDC__) || !__STDC__
 /* This is a separate conditional since some stdc systems
    reject `defined (const)'.  */