Add <strings.h> to pick up definition of bzero.

src/util.h

@@ -1,5 +1,6 @@
 /*
-  Copyright (C) 2003, 2004, 2005, 2008 Rocky Bernstein <rocky@gnu.org>
+  Copyright (C) 2003, 2004, 2005, 2008, 2011 
+  Rocky Bernstein <rocky@gnu.org>
   
   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -34,6 +35,9 @@
 #ifdef HAVE_STRING_H
 #include <string.h>
 #endif
+#ifdef HAVE_STRINGS_H
+#include <strings.h>
+#endif
 #include <ctype.h>
 
 #ifdef HAVE_STDARG_H