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=fdf02484289e155de56e7320f7e1dd1e57431f4b'>root</a>/<a href='/guix/log/gnu?id=fdf02484289e155de56e7320f7e1dd1e57431f4b'>gnu</a>/<a href='/guix/log/gnu/packages?id=fdf02484289e155de56e7320f7e1dd1e57431f4b'>packages</a>/<a href='/guix/log/gnu/packages/gnustep.scm?id=fdf02484289e155de56e7320f7e1dd1e57431f4b'>gnustep.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/gnustep.scm?id=fdf02484289e155de56e7320f7e1dd1e57431f4b&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2018-02-16 11:11:40 +0100'>2018-02-16</span></td><td><a href='/guix/commit/gnu/packages/gnustep.scm?id=48bbe06edfb41700abf66419b1f0c7e21d831d96'>gnu: gnustep: Update dockapps home pages.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/gnustep.scm (wmbattery, wmclock, wmcpuload)[home-pages]:
Use new dockapps.net domain.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2018-02-16 11:11:40 +0100'>2018-02-16</span></td><td><a href='/guix/commit/gnu/packages/gnustep.scm?id=bfe83d568c75434501a471dbaed273d213320470'>gnu: gnustep: Update phase style.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/gnustep.scm (windowmaker)[arguments]: Don't use %OUTPUT.
End phases with #t.
(wmbattery, wmclock)[arguments]: Substitute INVOKE for SYSTEM*.  End
phases with #t.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2018-02-16 11:11:40 +0100'>2018-02-16</span></td><td><a href='/guix/commit/gnu/packages/gnustep.scm?id=9a0a4a95f02f0ad2e3589af398421445f7e8a949'>gnu: wmcpuload: Update to 1.1.1.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/gnustep.scm (wmcpuload): Update to 1.1.1.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2018-02-16 11:11:40 +0100'>2018-02-16</span></td><td><a href='/guix/commit/gnu/packages/gnustep.scm?id=93710d861f5987b7e87221d39e568afd86357c80'>gnu: wmbattery: Update to 2.51.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/gnustep.scm (wmbattery): Update to 2.51.
[source]: Remove upstreamed bugfix snippet.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2017-12-22 18:48:23 -0500'>2017-12-22</span></td><td><a href='/guix/commit/gnu/packages/gnustep.scm?id=84958de1205a910f93841f313e6666d84dece8c4'>gnu: windowmaker: Enable xinerama support.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/gnustep.scm (windowmaker)[inputs]: Add libxinerama.
</span></span></td><td>Kei Kebreau</td></tr>
<tr><td><span title='2017-12-06 16:31:09 -0500'>2017-12-06</span></td><td><a href='/guix/commit/gnu/packages/gnustep.scm?id=537fe4568f4d7a90ab350a66cadfdf38c893bbee'>gnu: windowmaker: Add '.desktop' file.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/gnustep.scm (windowmaker)[arguments]: Add 'install-xsession'
phase. Add (guix build build-system), (guix build utils) and (ice-9 match) to
#:modules.
</span></span></td><td>Kei Kebreau</td></tr>
<tr><td><span title='2017-08-29 20:13:24 -0400'>2017-08-29</span></td><td><a href='/guix/commit/gnu/packages/gnustep.scm?id=3c8ba11a97d3f3b671b8919da8c41f0b0e2ccaf3'>Update e-mail for Kei Kebreau.</a><span class='msg-avail'>...<span class='msg-tooltip'>* .mailmap: Map kei@openmailbox.org to current address.
* gnu/local.mk: Replace kei@openmailbox.org to current address.
* gnu/packages/backup.scm: Likewise.
* gnu/packages/calendar.scm: Likewise.
* gnu/packages/check.scm: Likewise.
* gnu/packages/compression.scm: Likewise.
* gnu/packages/documentation.scm: Likewise.
* gnu/packages/emacs.scm: Likewise.
* gnu/packages/fltk.scm: Likewise.
* gnu/packages/freedesktop.scm: Likewise.
* gnu/packages/game-development.scm: Likewise.
* gnu/packages/games.scm: Likewise.
* gnu/packages/gnome.scm: Likewise.
* gnu/packages/gnustep.scm: Likewise.
* gnu/packages/gtk.scm: Likewise.
* gnu/packages/hexedit.scm: Likewise.
* gnu/packages/image.scm: Likewise.
* gnu/packages/maths.scm: Likewise.
* gnu/packages/music.scm: Likewise.
* gnu/packages/xfce.scm: Likewise.
* gnu/packages/python.scm: Likewise.
* gnu/packages/tcl.scm: Likewise.
* gnu/packages/textutils.scm: Likewise.
* gnu/packages/video.scm: Likewise.
* gnu/packages/w3m.scm: Likewise.
* gnu/packages/web.scm: Likewise.
* gnu/packages/web-browsers.scm: Likewise.
* gnu/packages/patches/wmfire-update-for-new-gdk-versions.patch: Likewise.
</span></span></td><td>Kei Kebreau</td></tr>
<tr><td><span title='2017-05-08 17:46:58 -0400'>2017-05-08</span></td><td><a href='/guix/commit/gnu/packages/gnustep.scm?id=4d8fd825a8adc528bc31501cec32ea4d11edcde8'>gnu: Add gnustep-make.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/gnustep.scm (gnustep-make): New variable.
</span></span></td><td>Kei Kebreau</td></tr>
<tr><td><span title='2017-04-24 11:23:31 -0400'>2017-04-24</span></td><td><a href='/guix/commit/gnu/packages/gnustep.scm?id=0611abff32ddf0dd6cfbbff74aee4c9a7abe1936'>gnu: wmfire: Update source code for new GDK versions.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/patches/wmfire-update-for-new-gdk-versions.patch: New
file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/gnustep.scm (wmfire)[source]: Add patch.
</span></span></td><td>Kei Kebreau</td></tr>