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='2022-06-05 20:27:37 -0700'>2022-06-05</span></td><td><a href='/guix/commit/gnu/packages/patches/ncftp-reproducible.patch?id=ce6d8ca4430e7df27c77e116a677679f241551da'>gnu: ncftp: Build reproducibly.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/patches/ncftp-reproducible.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add patch.
* gnu/packages/ftp.scm (ncftp): Add patch.
</span></span></td><td>Vagrant Cascadian</td></tr>