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=f958d8f062f4f5fa40a5646a59dcb0d67432ad09'>root</a>/<a href='/guix/log/tests?id=f958d8f062f4f5fa40a5646a59dcb0d67432ad09'>tests</a>/<a href='/guix/log/tests/print.scm?id=f958d8f062f4f5fa40a5646a59dcb0d67432ad09'>print.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/print.scm?id=f958d8f062f4f5fa40a5646a59dcb0d67432ad09&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2021-11-17 23:43:14 +0100'>2021-11-17</span></td><td><a href='/guix/commit/tests/print.scm?id=3a317f7476f8c6012e166ff9f340f861938721c9'>Merge branch 'master' into core-updates-frozen</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2021-11-11 00:14:31 +0100'>2021-11-11</span></td><td><a href='/guix/commit/tests/print.scm?id=3756ce32674139376bcf11dac96bc562582088f7'>import: print: Replace packages and origins in 'arguments'.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/import/print.scm (package-&gt;code)[variable-reference]
[object-&gt;code]: New procedures.
[package-lists-&gt;code]: Rewrite in terms of 'object-&gt;code'.
Pass the 'arguments' field through 'object-&gt;code'.
* tests/print.scm (pkg-with-arguments, pkg-with-arguments-source): New
variables.
("package with arguments"): New test.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2021-11-11 00:14:31 +0100'>2021-11-11</span></td><td><a href='/guix/commit/tests/print.scm?id=b2ed40c29f578d46d42cb1c5e99bd797cea3aba0'>import: print: Handle patches that are origins.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/import/print.scm (package-&gt;code)[source-&gt;code]: Handle patches
that are origins.
* tests/print.scm (pkg-with-origin-input): Add 'patches' field.
(pkg-with-origin-patch, pkg-with-origin-patch-source): New variables.
("package with origin patch"): New test.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2021-11-11 00:14:31 +0100'>2021-11-11</span></td><td><a href='/guix/commit/tests/print.scm?id=b3240ae846cb1ace2322a68eca3497f11d0be6f1'>import: print: Correctly handle URI lists.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/import/print.scm (package-&gt;code)[factorized-uri-code]: New
procedure.
[source-&gt;code]: Use it, and factorize URI when it's a list.
* tests/print.scm (pkg-with-origin-input): Check origin URI to a list.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2021-11-11 00:14:31 +0100'>2021-11-11</span></td><td><a href='/guix/commit/tests/print.scm?id=04d929570ad816793d7e0024a11314124ce87f98'>import: print: Properly render packages with origins as inputs.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/import/print.scm (package-&gt;code)[source-&gt;code]: Check whether
VERSION is true before calling 'factorize-uri'.
[package-lists-&gt;code]: Add clause for inputs that are origins.
* tests/print.scm (pkg-with-origin-input, pkg-with-origin-input-source):
New variables.
("package with origin input"): New test.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2021-07-11 00:49:16 +0200'>2021-07-11</span></td><td><a href='/guix/commit/tests/print.scm?id=ff992fcfaf8455910b4bb5e02861fe9ae3dfd974'>import: print: Emit new-style package inputs when possible.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/import/print.scm (redundant-input-labels?): New procedure.
(package-&gt;code)[package-lists-&gt;code]: Rename to...
[inputs-&gt;code]: ... this.  When 'redundant-input-labels?' returns true,
emit label-less inputs.  Adjust callers to new name.
* tests/print.scm (pkg-with-inputs): Adjust accordingly.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-04-20 10:57:49 +0200'>2020-04-20</span></td><td><a href='/guix/commit/tests/print.scm?id=10af34cd7f1f4f9fb50db826d06233c83a9c0439'>tests: Update expected values for package-&gt;code.</a><span class='msg-avail'>...<span class='msg-tooltip'>Reported by janneke on IRC.

* tests/print.scm: Update expected package definitions produced by package-&gt;code.
</span></span></td><td>Ricardo Wurmus</td></tr>