Fix for <https://nvd.nist.gov/vuln/detail?vulnId=CVE-2015-8327>.

--- a/util.c	2014-06-20 19:26:18 +0000
+++ b/util.c	2015-10-30 15:45:03 +0000
@@ -31,7 +31,7 @@
 #include <assert.h>
 
 
-const char* shellescapes = "|<>&!$\'\"#*?()[]{}";
+const char* shellescapes = "|<>&!$\'\"`#*?()[]{}";
 
 const char * temp_dir()
 {

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<tr><td><span title='2019-12-08 00:47:26 +0100'>2019-12-08</span></td><td><a href='/guix/commit/gnu/services/mcron.scm?id=e7d45693d979fdb88dc6eed2a67797c4f8c4b420'>services: mcron: Add description.</a><span class='msg-avail'>...</span></td><td>Robert Vollmert</td></tr>
<tr><td><span title='2019-06-15 18:15:23 +0200'>2019-06-15</span></td><td><a href='/guix/commit/gnu/services/mcron.scm?id=f3d797005374e5333c7596fe86b4a524ab1b9b11'>services: Remove unneeded imports that led to cycles.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-05-12 18:16:37 +0100'>2019-05-12</span></td><td><a href='/guix/commit/gnu/services/mcron.scm?id=f8cd07e8d8acf85fd6d08646a0719178895b5894'>services: mcron: Log to a file.</a><span class='msg-avail'>...</span></td><td>Christopher Baines</td></tr>
<tr><td><span title='2019-01-28 14:57:10 +0100'>2019-01-28</span></td><td><a href='/guix/commit/gnu/services/mcron.scm?id=0791437f972caa7e48de91ad5cb150a614f617c2'>gnu: Move most packages from guile.scm to new module.</a><span class='msg-avail'>...</span></td><td>Ricardo Wurmus</td></tr>
<tr><td><span title='2019-01-11 12:14:38 +0100'>2019-01-11</span></td><td><a href='/guix/commit/gnu/services/mcron.scm?id=84a2de36a10dc2ab80f86e16721cbd228c85279e'>services: Deprecate a few more service procedures.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-11-13 14:59:45 +0100'>2018-11-13</span></td><td><a href='/guix/commit/gnu/services/mcron.scm?id=190877748eeadff475dca822847fb3a5cc4467b9'>services: mcron: Fix typo in comment.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-07-13 00:08:55 +0200'>2018-07-13</span></td><td><a href='/guix/commit/gnu/services/mcron.scm?id=147c5aa5d4e3bd21ee4c4cae70dff8da0bcf94b7'>services: mcron: Add 'schedule' action.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-03-19 23:19:49 +0100'>2018-03-19</span></td><td><a href='/guix/commit/gnu/services/mcron.scm?id=cfbf6de18cc70d2e385feb5f61f9363f18e78ddf'>gnu: mcron: Update to 1.1 and deprecate "mcron2".</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>