Fix Perl module Module::Pluggable such that it can find plugins that live in
symlinked directories.

Patch borrowed/adapted from Nixpkgs.

--- Module-Pluggable-5.2/lib/Module/Pluggable/Object.pm   2015-04-08 23:28:48.120164135 -0500
+++ Module-Pluggable-5.2/lib/Module/Pluggable/Object.pm   2015-04-08 23:30:27.032166704 -0500
@@ -164,7 +164,7 @@
         my $sp = catdir($dir, (split /::/, $searchpath));

         # if it doesn't exist or it's not a dir then skip it
-        next unless ( -e $sp && -d _ ); # Use the cached stat the second time
+        next unless ( -e $sp );

         my @files = $self->find_files($sp);

@@ -279,7 +279,7 @@
                              (my $path = $File::Find::name) =~ s#^\\./##;
                              push @files, $path;
                            }
-                      }, $search_path );
+                      }, "$search_path/." );
     }
     #chdir $cwd;
     return @files;zed Guix</td><td class='sub right'></td></tr></table>
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<div class='path'>path: <a href='/guix/log/?id=200ddf3aa3aad53786c0a124ab52f9ffff73dc34'>root</a>/<a href='/guix/log/po?id=200ddf3aa3aad53786c0a124ab52f9ffff73dc34'>po</a>/<a href='/guix/log/po/doc?id=200ddf3aa3aad53786c0a124ab52f9ffff73dc34'>doc</a>/<a href='/guix/log/po/doc/guix-manual.ru.po?id=200ddf3aa3aad53786c0a124ab52f9ffff73dc34'>guix-manual.ru.po</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/po/doc/guix-manual.ru.po?id=200ddf3aa3aad53786c0a124ab52f9ffff73dc34&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2021-05-10 22:34:43 -0400'>2021-05-10</span></td><td><a href='/guix/commit/po/doc/guix-manual.ru.po?id=21fcced608c93e1ac836cdd9ab8c5d200c667e75'>nls: Update translations.</a></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2021-04-18 13:18:34 +0200'>2021-04-18</span></td><td><a href='/guix/commit/po/doc/guix-manual.ru.po?id=0cfe02cf55baf8ef1395bc8f108672159355f606'>nls: Update 'ru' translation.</a></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2020-11-05 16:42:38 +0100'>2020-11-05</span></td><td><a href='/guix/commit/po/doc/guix-manual.ru.po?id=eff2cabdde1077928868d06ac197f03f114f03fe'>nls: Update translations of the manual.</a></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2020-10-29 20:19:05 +0100'>2020-10-29</span></td><td><a href='/guix/commit/po/doc/guix-manual.ru.po?id=759774bc69e91c9db6f5070b75d5a5fe9b36c04b'>nls: Update 'ru' translation of the manual.</a></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2020-05-05 23:45:56 +0200'>2020-05-05</span></td><td><a href='/guix/commit/po/doc/guix-manual.ru.po?id=0701274446bbd39b053a0c65947fd7f1319f7bf6'>nls: Update.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-04-12 00:18:05 +0200'>2020-04-12</span></td><td><a href='/guix/commit/po/doc/guix-manual.ru.po?id=935ef44b398353b5b6af94e185d7b0c3d833db0b'>nls: Update.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-03-23 00:06:58 +0100'>2020-03-23</span></td><td><a href='/guix/commit/po/doc/guix-manual.ru.po?id=86603d8660e42a3b5d8b407e456a98429943bc7e'>nls: Update.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-05-13 10:46:03 +0200'>2019-05-13</span></td><td><a href='/guix/commit/po/doc/guix-manual.ru.po?id=3bac7e6495934de9913e6186d954d1331883e064'>doc: Add Russian translation.</a><span class='msg-avail'>...<span class='msg-tooltip'>* doc/local.mk (info_TEXINFOS): Add guix.ru.texi.
(TRANSLATED_INFO): Add {guix,contributing}.ru.texi.
* po/doc/local.mk (DOC_PO_FILES): Add guix-manual.ru.po.
* po/doc/guix-manual.ru.po: New file.
</span></span></td><td>Ludovic Courtès</td></tr>