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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<div class='path'>path: <a href='/guix/log/?id=fb8c4bc6baba7a332f071183435fdb426c1365fe'>root</a>/<a href='/guix/log/gnu?id=fb8c4bc6baba7a332f071183435fdb426c1365fe'>gnu</a>/<a href='/guix/log/gnu/services?id=fb8c4bc6baba7a332f071183435fdb426c1365fe'>services</a>/<a href='/guix/log/gnu/services/certbot.scm?id=fb8c4bc6baba7a332f071183435fdb426c1365fe'>certbot.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/services/certbot.scm?id=fb8c4bc6baba7a332f071183435fdb426c1365fe&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2018-04-03 16:21:31 +0200'>2018-04-03</span></td><td><a href='/guix/commit/gnu/services/certbot.scm?id=f72662968e757ed79eefa1990b5b94d802571632'>services: certbot: Don't try to renew certificates on activation.</a><span class='msg-avail'>...</span></td><td>Clément Lassieur</td></tr>
<tr><td><span title='2018-03-20 17:17:58 +0100'>2018-03-20</span></td><td><a href='/guix/commit/gnu/services/certbot.scm?id=4a78fd4617908546be15d2c101f5cab512c71f8e'>Correct name and Email for ng0.</a><span class='msg-avail'>...</span></td><td>ng0</td></tr>
<tr><td><span title='2018-02-22 21:43:54 +0100'>2018-02-22</span></td><td><a href='/guix/commit/gnu/services/certbot.scm?id=fece75fe356ce9f99d1d13baaa5f195c510f187b'>services: certbot: Allow to set a deploy hook.</a><span class='msg-avail'>...</span></td><td>Clément Lassieur</td></tr>
<tr><td><span title='2018-02-22 21:43:54 +0100'>2018-02-22</span></td><td><a href='/guix/commit/gnu/services/certbot.scm?id=e216c797f7432cbf21f991b1eff97821ace17140'>services: certbot: Add verbosity.</a><span class='msg-avail'>...</span></td><td>Clément Lassieur</td></tr>
<tr><td><span title='2018-02-22 21:43:54 +0100'>2018-02-22</span></td><td><a href='/guix/commit/gnu/services/certbot.scm?id=a2cb2bbc0ba984398dd79ff7bd37af8960f67ced'>services: certbot: Allow to set RSA key size.</a><span class='msg-avail'>...</span></td><td>Clément Lassieur</td></tr>
<tr><td><span title='2018-02-22 21:43:53 +0100'>2018-02-22</span></td><td><a href='/guix/commit/gnu/services/certbot.scm?id=c3215d2f9d8fa4b890e3a41ceb4404b76a7c5c49'>services: certbot: Associate one certificate with several domains.</a><span class='msg-avail'>...</span></td><td>Clément Lassieur</td></tr>
<tr><td><span title='2018-02-22 21:43:53 +0100'>2018-02-22</span></td><td><a href='/guix/commit/gnu/services/certbot.scm?id=65fc1d890d2e33e62a7c9d9fe31184c48d848e0c'>services: certbot: Get certbot to run non-interactively.</a><span class='msg-avail'>...</span></td><td>Clément Lassieur</td></tr>
<tr><td><span title='2018-02-22 21:43:53 +0100'>2018-02-22</span></td><td><a href='/guix/commit/gnu/services/certbot.scm?id=c1dfcfdf58b4a05903d6b4266ca3c04f1c4cb6e2'>services: certbot: Refactor certbot command.</a><span class='msg-avail'>...</span></td><td>Clément Lassieur</td></tr>
<tr><td><span title='2018-02-22 21:43:53 +0100'>2018-02-22</span></td><td><a href='/guix/commit/gnu/services/certbot.scm?id=966fd7b7e9f321a02e740659ab1c1853e34533b5'>services: certbot: Rename 'host' to 'domain'.</a><span class='msg-avail'>...</span></td><td>Clément Lassieur</td></tr>
<tr><td><span title='2018-02-22 21:43:53 +0100'>2018-02-22</span></td><td><a href='/guix/commit/gnu/services/certbot.scm?id=301518638fbb2344b523623317bb5cd084e80d44'>services: certbot: Fix indentation.</a><span class='msg-avail'>...</span></td><td>Clément Lassieur</td></tr>
<tr><td><span title='2018-02-22 21:43:52 +0100'>2018-02-22</span></td><td><a href='/guix/commit/gnu/services/certbot.scm?id=7ab04c17c01a926660cd1c9fa9311a5efc6716da'>services: certbot: Run certbot twice a day at a random minute.</a><span class='msg-avail'>...</span></td><td>Clément Lassieur</td></tr>
<tr><td><span title='2018-02-22 21:43:52 +0100'>2018-02-22</span></td><td><a href='/guix/commit/gnu/services/certbot.scm?id=70cd2239a567fe551bdbe368b1d2b9d9cf531d09'>services: certbot: Listen on IPv6.</a><span class='msg-avail'>...</span></td><td>Clément Lassieur</td></tr>
<tr><td><span title='2017-12-18 12:03:14 +0100'>2017-12-18</span></td><td><a href='/guix/commit/gnu/services/certbot.scm?id=8b223ceac4ff0781e95d69362875f87cff03f4d6'>services: nginx: Replace 'http-port' and 'https-port' with 'listen'.</a><span class='msg-avail'>...</span></td><td>Clément Lassieur</td></tr>
<tr><td><span title='2017-12-17 20:37:12 +0000'>2017-12-17</span></td><td><a href='/guix/commit/gnu/services/certbot.scm?id=e8a051ee7c140886bce8dcd191cb10918b2d4078'>services: certbot: Fix certbot renewal job.</a><span class='msg-avail'>...</span></td><td>Christopher Baines</td></tr>
<tr><td><span title='2017-11-28 23:34:25 +0100'>2017-11-28</span></td><td><a href='/guix/commit/gnu/services/certbot.scm?id=3af03e5967cf49ed1a4382dad7d75daa95ec5217'>services: certbot: Add default value and description.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-11-28 23:34:24 +0100'>2017-11-28</span></td><td><a href='/guix/commit/gnu/services/certbot.scm?id=1115f140179b8fafb5a0f7c91a22dfdb7d6b21cc'>services: Add certbot service.</a><span class='msg-avail'>...</span></td><td>Andy Wingo</td></tr>