Fix a deprecation warning with newer Perl that breaks some tests.

--- a/tp/Texinfo/Parser.pm
+++ b/tp/Texinfo/Parser.pm
@@ -5438,12 +5438,12 @@
     }
   } elsif ($command eq 'clickstyle') {
     # REMACRO
-    if ($line =~ /^\s+@([[:alnum:]][[:alnum:]\-]*)({})?\s*/) {
+    if ($line =~ /^\s+@([[:alnum:]][[:alnum:]\-]*)(\{})?\s*/) {
       $args = ['@'.$1];
       $self->{'clickstyle'} = $1
         unless(_ignore_global_commands($self));
       $remaining = $line;
-      $remaining =~ s/^\s+@([[:alnum:]][[:alnum:]\-]*)({})?\s*(\@(c|comment)((\@|\s+).*)?)?//;
+      $remaining =~ s/^\s+@([[:alnum:]][[:alnum:]\-]*)(\{})?\s*(\@(c|comment)((\@|\s+).*)?)?//;
       $has_comment = 1 if (defined($4));
     } else {
       $self->line_error (sprintf($self->__(
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<tr><td><span title='2020-10-02 14:58:01 +0200'>2020-10-02</span></td><td><a href='/guix/commit/gnu/services/cuirass.scm?id=d6a8f0a9781a90c3037f25e51d7ff32e50f7a8c1'>services: cuirass: Fix activation.</a><span class='msg-avail'>...</span></td><td>Mathieu Othacehe</td></tr>
<tr><td><span title='2020-09-24 13:51:57 +0200'>2020-09-24</span></td><td><a href='/guix/commit/gnu/services/cuirass.scm?id=a024eedb1c0a537aa236fa27fe7a94ba6aa3d76c'>services: cuirass: Create queries log files at activation.</a><span class='msg-avail'>...</span></td><td>Mathieu Othacehe</td></tr>
<tr><td><span title='2020-09-24 11:28:59 +0200'>2020-09-24</span></td><td><a href='/guix/commit/gnu/services/cuirass.scm?id=80e26d74294d40f311f61d13996f1ed1aa4d8edd'>services: cuirass: Add web SQL queries logging support.</a><span class='msg-avail'>...</span></td><td>Mathieu Othacehe</td></tr>
<tr><td><span title='2020-09-24 10:47:22 +0200'>2020-09-24</span></td><td><a href='/guix/commit/gnu/services/cuirass.scm?id=92e507c963470c6086a59ca8e1dd58ed4403649c'>services: cuirass: Add SQL queries logging support.</a><span class='msg-avail'>...</span></td><td>Mathieu Othacehe</td></tr>
<tr><td><span title='2020-03-08 23:46:11 +0000'>2020-03-08</span></td><td><a href='/guix/commit/gnu/services/cuirass.scm?id=af96c1e0e42978594b27bcf957d75b304f107998'>services: cuirass: Allow passing extra command line options.</a><span class='msg-avail'>...</span></td><td>Christopher Baines</td></tr>
<tr><td><span title='2020-01-06 16:31:54 +0100'>2020-01-06</span></td><td><a href='/guix/commit/gnu/services/cuirass.scm?id=6a7c4636d4dec47eefa03c95da5a1315bd0e0413'>Adjust module autoloads.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-10-23 21:48:51 +0200'>2019-10-23</span></td><td><a href='/guix/commit/gnu/services/cuirass.scm?id=b40f4a5995cff00077aa60881737d0d0f6871982'>services: cuirass: Create /var/log/cuirass during activation.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-09-23 23:41:19 +0200'>2019-09-23</span></td><td><a href='/guix/commit/gnu/services/cuirass.scm?id=46e552cb0f6b7b11600b7c41146f94dce70eee99'>services: cuirass: Remove unneeded conditional.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-08-29 08:06:54 +0200'>2019-08-29</span></td><td><a href='/guix/commit/gnu/services/cuirass.scm?id=3e7a62e2e40fc575d161e4c06ea2e333ab7df3b3'>services: cuirass: Log web interface to separate file.</a><span class='msg-avail'>...</span></td><td>Ricardo Wurmus</td></tr>
<tr><td><span title='2019-08-26 22:21:10 +0200'>2019-08-26</span></td><td><a href='/guix/commit/gnu/services/cuirass.scm?id=159b5e1f8a758e5754ea36929990f09436f4de47'>services: cuirass: Split into two separate services.</a><span class='msg-avail'>...</span></td><td>Ricardo Wurmus</td></tr>
<tr><td><span title='2019-03-04 15:22:58 +0100'>2019-03-04</span></td><td><a href='/guix/commit/gnu/services/cuirass.scm?id=56a93cb975ddc33d50183fb122e2aafda026f18e'>services: Use 'file-append' for user account shells.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-11-07 16:06:42 +0100'>2018-11-07</span></td><td><a href='/guix/commit/gnu/services/cuirass.scm?id=dcb45127e01ce2eeabc9270b64e817aa1d644672'>services: cuirass: Add 'ttl' configuration field.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-08-16 19:23:29 +0200'>2018-08-16</span></td><td><a href='/guix/commit/gnu/services/cuirass.scm?id=8d4805ba2934e492524512aac8a95662f2cf97c7'>services: cuirass: Put data in /var/lib to avoid removal at boot.</a><span class='msg-avail'>...</span></td><td>Clément Lassieur</td></tr>
<tr><td><span title='2018-07-16 22:08:58 +0200'>2018-07-16</span></td><td><a href='/guix/commit/gnu/services/cuirass.scm?id=cd62e5d36835a7ec7b003500f1d1ad58b09738e3'>services: cuirass: Remove the LOAD-PATH option.</a><span class='msg-avail'>...</span></td><td>Clément Lassieur</td></tr>