hack until gzip pulls a newer gnulib version

From 66712c23388e93e5c518ebc8515140fa0c807348 Mon Sep 17 00:00:00 2001
From: Eric Blake <eblake@redhat.com>
Date: Thu, 29 Mar 2012 13:30:41 -0600
Subject: [PATCH] stdio: don't assume gets any more

Gnulib intentionally does not have a gets module, and now that C11
and glibc have dropped it, we should be more proactive about warning
any user on a platform that still has a declaration of this dangerous
interface.

--- a/srclib/stdio.in.h
+++ b/srclib/stdio.in.h
@@ -744,7 +744,6 @@ _GL_WARN_ON_USE (getline, "getline is un
    removed it.  */
 #undef gets
 #if HAVE_RAW_DECL_GETS && !defined __cplusplus
-_GL_WARN_ON_USE (gets, "gets is a security hole - use fgets instead");
 #endif
 
 #if @GNULIB_OBSTACK_PRINTF@ || @GNULIB_OBSTACK_PRINTF_POSIX@