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.

--- cpio-2.11/gnu/stdio.in.h-orig	2012-11-25 22:17:06.000000000 +0400
+++ cpio-2.11/gnu/stdio.in.h		2012-11-25 22:18:36.000000000 +0400
@@ -135,12 +135,6 @@
                  "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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<tr><td><span title='2020-07-01 17:52:40 +0200'>2020-07-01</span></td><td><a href='/guix/commit/gnu/packages/ncdu.scm?id=e75d8234e7184070d20645baf8ab55257a731b25'>gnu: ncdu: Fix up synopsis &amp; description.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-07-01 17:52:40 +0200'>2020-07-01</span></td><td><a href='/guix/commit/gnu/packages/ncdu.scm?id=57e0b9e87c37692beb4f37ff668fe3a0b9b1d668'>gnu: ncdu: Update to 1.15.1.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-06-03 20:45:20 +0200'>2020-06-03</span></td><td><a href='/guix/commit/gnu/packages/ncdu.scm?id=5122961329906dd1cd721ad3d0659ce4038f6cc8'>gnu: ncdu: Update to 1.15.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-02-17 21:56:57 +0100'>2020-02-17</span></td><td><a href='/guix/commit/gnu/packages/ncdu.scm?id=aa7773402328920f79feebc380e750226cbda5ec'>gnu: ncdu: Update to 1.14.2.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2019-12-01 00:49:13 +0100'>2019-12-01</span></td><td><a href='/guix/commit/gnu/packages/ncdu.scm?id=7e59d21f9eba4d1a189f9d275779f4a849240653'>gnu: ncdu: Update to 1.14.1.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>