This patch is needed to allow builds with newer versions of
the GNU libc (2.16+).

This is a backport of this patch:

commit 66712c23388e93e5c518ebc8515140fa0c807348
Author: Eric Blake <eblake@redhat.com>
Date:   Thu Mar 29 13:30:41 2012 -0600

    stdio: don't assume gets any more
    
--- gzip/lib/stdio.in.h	2012-07-02 14:28:45.000000000 +0200
+++ gzip/lib/stdio.in.h	2012-07-02 14:28:50.000000000 +0200
@@ -160,12 +160,6 @@ _GL_WARN_ON_USE (fflush, "fflush is not
                  "use gnulib module fflush for portable POSIX compliance");
 #endif
 
-/* It is very rare that the developer ever has full control of stdin,
-   so any use of gets warrants an unconditional warning.  Assume it is
-   always declared, since it is required by C89.  */
-#undef gets
-_GL_WARN_ON_USE (gets, "gets is a security hole - use fgets instead");
-
 #if @GNULIB_FOPEN@
 # if @REPLACE_FOPEN@
 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)