Skip this performance regression test.

The test measures things on the order of 20ms.  On a loaded machine, we
have seen enough variation that the test would fail.

--- grep-2.22/tests/long-pattern-perf	2016-01-03 12:52:38.491575007 +0100
+++ grep-2.22/tests/long-pattern-perf	2016-01-03 12:53:39.768464687 +0100
@@ -16,6 +16,7 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+exit 77
 . "${srcdir=.}/init.sh"; path_prepend_ ../src
 
 fail=0
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<div class='path'>path: <a href='/guix/log/?id=ca080b3efb726a4d63838f1eeaf2036a6c2d8dad&amp;showmsg=1'>root</a>/<a href='/guix/log/gnu?id=ca080b3efb726a4d63838f1eeaf2036a6c2d8dad&amp;showmsg=1'>gnu</a>/<a href='/guix/log/gnu/packages?id=ca080b3efb726a4d63838f1eeaf2036a6c2d8dad&amp;showmsg=1'>packages</a>/<a href='/guix/log/gnu/packages/debian.scm?id=ca080b3efb726a4d63838f1eeaf2036a6c2d8dad&amp;showmsg=1'>debian.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/gnu/packages/debian.scm?id=ca080b3efb726a4d63838f1eeaf2036a6c2d8dad'>Collapse</a>)</th><th class='left'>Author</th></tr>
<tr class='logheader'><td><span title='2020-08-29 05:26:53 +0200'>2020-08-29</span></td><td class='logsubject'><a href='/guix/commit/gnu/packages/debian.scm?id=34017e3fea4aaee2e4e0c6616f5646cf665c5d0f'>gnu: debianutils: Update to 4.11.1.</a></td><td>Tobias Geerinckx-Rice</td></tr>
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* gnu/packages/debian.scm (debianutils): Update to 4.11.1.


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<tr class='logheader'><td><span title='2020-07-02 23:20:50 +0200'>2020-07-02</span></td><td class='logsubject'><a href='/guix/commit/gnu/packages/debian.scm?id=dd3bd0be24cb99226a5fb3422cbc3039c57e9663'>gnu: Add debianutils.</a></td><td>Marius Bakke</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* gnu/packages/debian.scm (debianutils): New public variable.


</td></tr>
<tr class='logheader'><td><span title='2020-06-26 01:53:59 +0200'>2020-06-26</span></td><td class='logsubject'><a href='/guix/commit/gnu/packages/debian.scm?id=6941004fb0faf82250ab3975f28ec1eb6f373d2a'>gnu: debootstrap: Wrap with gpg and wget in PATH.</a></td><td>Marius Bakke</td></tr>
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* gnu/packages/debian.scm (debootstrap)[inputs]: Add GNUPG and WGET.


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<tr class='logheader'><td><span title='2020-05-01 01:21:03 +0200'>2020-05-01</span></td><td class='logsubject'><a href='/guix/commit/gnu/packages/debian.scm?id=524e5fe56b602d2ccb1dd2bf5a50a0e6ca397759'>gnu: Add apt-mirror.</a></td><td>Jean-Baptiste Note</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* gnu/packages/debian.scm (apt-mirror): New variable.

Signed-off-by: Ludovic Courtès &lt;ludo@gnu.org&gt;


</td></tr>
<tr class='logheader'><td><span title='2020-04-13 06:56:54 +0200'>2020-04-13</span></td><td class='logsubject'><a href='/guix/commit/gnu/packages/debian.scm?id=6729488f59c402fef575629d2f9490480995bd64'>gnu: debootstrap: Update to 1.0.123.</a></td><td>Tobias Geerinckx-Rice</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* gnu/packages/debian.scm (debootstrap): Update to 1.0.123.


</td></tr>
<tr class='logheader'><td><span title='2020-03-02 21:33:28 +0200'>2020-03-02</span></td><td class='logsubject'><a href='/guix/commit/gnu/packages/debian.scm?id=bdcec7028c6d7ddd18e4a169b514bd2d1f8b9e2e'>gnu: debootstrap: Update to 1.0.119.</a></td><td>Vincent Legoll</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* gnu/packages/debian.scm (debootstrap): Update to 1.0.119.

Signed-off-by: Efraim Flashner &lt;efraim@flashner.co.il&gt;


</td></tr>
<tr class='logheader'><td><span title='2020-02-23 14:07:17 +0200'>2020-02-23</span></td><td class='logsubject'><a href='/guix/commit/gnu/packages/debian.scm?id=3d314a5642a57aa70248c7ee61789d4d53aedae6'>gnu: debootstrap: Update to 1.0.118</a></td><td>Vincent Legoll</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
The attached patch has been tested by creating
arm64, mipsel &amp; amd64 chroots and the amd64
one has been actually run.

--
Vincent Legoll

From a23b962c21e20c72f425675e6ea6e11cd0f944d0 Mon Sep 17 00:00:00 2001
From: Vincent Legoll &lt;vincent.legoll@gmail.com&gt;
Date: Fri, 21 Feb 2020 23:34:40 +0100
Subject: [PATCH] gnu: debootstrap: Update to 1.0.118. *
 gnu/packages/debian.scm (debootstrap): Update to 1.0.118.

Signed-off-by: Efraim Flashner &lt;efraim@flashner.co.il&gt;


</td></tr>