Fix CVE-2014-2524:

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-2524
http://lists.gnu.org/archive/html/bug-readline/2014-03/msg00057.html

Patch copied from:
https://ftp.gnu.org/gnu/readline/readline-6.3-patches/readline63-003

			   READLINE PATCH REPORT
			   =====================

Readline-Release: 6.3
Patch-ID: readline63-003

Bug-Reported-by:
Bug-Reference-ID:
Bug-Reference-URL:

Bug-Description:

There are debugging functions in the readline release that are theoretically
exploitable as security problems.  They are not public functions, but have
global linkage.

Patch (apply with `patch -p0'):

*** ../readline-6.3/util.c	2013-09-02 13:36:12.000000000 -0400
--- util.c	2014-03-20 10:25:53.000000000 -0400
***************
*** 477,480 ****
--- 479,483 ----
  }
  
+ #if defined (DEBUG)
  #if defined (USE_VARARGS)
  static FILE *_rl_tracefp;
***************
*** 539,542 ****
--- 542,546 ----
  }
  #endif
+ #endif /* DEBUG */
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<tr><td><span title='2021-04-05 18:26:36 +0100'>2021-04-05</span></td><td><a href='/guix/commit/gnu/tests/virtualization.scm?id=81f65a3a2c5f4d1a5e8d74a4525181d8ae7d5408'>tests: libvirt: Catch issues with incorrect /var and /etc in package.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/tests/virtualization.scm (run-libvirt-test): Chdir to "/tmp" before
running test.  Add "connect" test.
</span></span></td><td>Pierre Langlois</td></tr>
<tr><td><span title='2020-10-01 15:47:29 +0200'>2020-10-01</span></td><td><a href='/guix/commit/gnu/tests/virtualization.scm?id=18e76f89055f25f015fadb7c999b410f38a88cc6'>services: hurd-vm: Resurrect system-test by using raw disk-image.</a><span class='msg-avail'>...<span class='msg-tooltip'>Using the new compressed-qcow2 image breaks this test.

* gnu/tests/virtualization.scm (hurd-vm-disk-image-raw): New procedure.
(%childhurd-os): Use it.
</span></span></td><td>Jan (janneke) Nieuwenhuizen</td></tr>
<tr><td><span title='2020-09-29 21:56:28 +0200'>2020-09-29</span></td><td><a href='/guix/commit/gnu/tests/virtualization.scm?id=c11c19bd4d0dc4ec56b949647057dbf00567f2ae'>services: hurd-vm: Add system test.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/tests/virtualization.scm (%childhurd-os): New variable.
(run-childhurd-test): New procedure.
(%test-childhurd): New variable.
</span></span></td><td>Ludovic Courtès</td></tr>