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

The upstream fix was:

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

      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.

      * m4/stdio_h.m4 (gl_STDIO_H, gl_STDIO_H_DEFAULTS): Drop gets
      support.
      * modules/stdio (Makefile.am): Likewise.
      * lib/stdio-read.c (gets): Likewise.
      * tests/test-stdio-c++.cc: Likewise.
      * m4/warn-on-use.m4 (gl_WARN_ON_USE_PREPARE): Fix comment.
      * lib/stdio.in.h (gets): Make warning occur in more places.
      * doc/posix-functions/gets.texi (gets): Update documentation.
      Reported by Christer Solskogen.

      Signed-off-by: Eric Blake <eblake@redhat.com>

This patch just gets rid of the offending part.

--- m4-1.4.16/lib/stdio.in.h.orig	2012-09-01 01:05:36.000000000 +0200
+++ m4-1.4.16/lib/stdio.in.h	2012-09-01 01:05:42.000000000 +0200
@@ -158,12 +158,6 @@ _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)
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<div class='path'>path: <a href='/guix/log/?id=789a39a82c10ec0e6e738afa6f99d6ff130c052a'>root</a>/<a href='/guix/log/tests?id=789a39a82c10ec0e6e738afa6f99d6ff130c052a'>tests</a>/<a href='/guix/log/tests/store.scm?id=789a39a82c10ec0e6e738afa6f99d6ff130c052a'>store.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/tests/store.scm?id=789a39a82c10ec0e6e738afa6f99d6ff130c052a&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2019-10-16 22:53:40 +0200'>2019-10-16</span></td><td><a href='/guix/commit/tests/store.scm?id=81c580c8664bfeeb767e2c47ea343004e88223c7'>daemon: Make 'profiles/per-user' non-world-writable.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-06-10 22:42:59 +0200'>2019-06-10</span></td><td><a href='/guix/commit/tests/store.scm?id=f8a9f99cd602ce1dc5307cb0c21ae718ad8796bb'>store: 'build-things' accepts derivation/output pairs.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>