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

Patch borrowed/adapted from Nixpkgs.

--- perl-5.16.1/cpan/Module-Pluggable/lib/Module/Pluggable/Object.pm	2015-04-08 23:28:48.120164135 -0500
+++ perl-5.16.1/cpan/Module-Pluggable/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;
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<tr><td><span title='2020-01-17 18:30:33 +0100'>2020-01-17</span></td><td><a href='/guix/commit/.mailmap?id=a3143063aeeecb5c02f75a6e1ddc0cc295e0e4f8'>Update email address for Amin Bandali.</a><span class='msg-avail'>...</span></td><td>Amin Bandali</td></tr>
<tr><td><span title='2019-12-19 11:35:23 -0600'>2019-12-19</span></td><td><a href='/guix/commit/.mailmap?id=4b3ff36228da17db980c98fe9e1669be613a5402'>Update email for Brett Gilio.</a><span class='msg-avail'>...</span></td><td>Brett Gilio</td></tr>
<tr><td><span title='2019-12-18 22:57:44 -0600'>2019-12-18</span></td><td><a href='/guix/commit/.mailmap?id=a7cdf124c0b28be6c4e750161c1341753eede7b8'>gnu: leocad: Update to 19.07.1.</a><span class='msg-avail'>...</span></td><td>Eric Bavier</td></tr>
<tr><td><span title='2019-05-03 08:45:55 +0200'>2019-05-03</span></td><td><a href='/guix/commit/.mailmap?id=3e85909044d8d9b492bcd2ecedde26d71794f145'>Correct email address for ison.</a><span class='msg-avail'>...</span></td><td>ison</td></tr>
<tr><td><span title='2019-03-18 15:05:08 +0100'>2019-03-18</span></td><td><a href='/guix/commit/.mailmap?id=47956fa0c24efcdcba3493f0231c30e9a39ec7df'>Correct name and email address for ng0.</a><span class='msg-avail'>...</span></td><td>ng0</td></tr>
<tr><td><span title='2019-01-21 10:10:43 +0100'>2019-01-21</span></td><td><a href='/guix/commit/.mailmap?id=e3634bd0a3480bde3aba5bd6d84d7aff25413207'>Update .mailmap.</a><span class='msg-avail'>...</span></td><td>Mathieu Othacehe</td></tr>
<tr><td><span title='2018-08-27 14:46:26 +0200'>2018-08-27</span></td><td><a href='/guix/commit/.mailmap?id=4715f92ef0b9650cc4075c69f17aa51e84da3f21'>Update email for Pierre Neidhardt.</a><span class='msg-avail'>...</span></td><td>Pierre Neidhardt</td></tr>
<tr><td><span title='2018-07-16 17:14:39 +0200'>2018-07-16</span></td><td><a href='/guix/commit/.mailmap?id=8bbb79cf95a07a40950448a8a09d888254404ed4'>mailmap: Add a line for Pierre-Antoine.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-07-16 16:53:50 +0200'>2018-07-16</span></td><td><a href='/guix/commit/.mailmap?id=33f4d14ab17096984404fc404b4539d784ecbf32'>mailmap: Add another line for myself.</a><span class='msg-avail'>...</span></td><td>Nils Gillmann</td></tr>
<tr><td><span title='2018-03-20 17:17:58 +0100'>2018-03-20</span></td><td><a href='/guix/commit/.mailmap?id=4a78fd4617908546be15d2c101f5cab512c71f8e'>Correct name and Email for ng0.</a><span class='msg-avail'>...</span></td><td>ng0</td></tr>
<tr><td><span title='2018-02-11 09:44:11 -0500'>2018-02-11</span></td><td><a href='/guix/commit/.mailmap?id=c275462025917ad7b8e182f29d6580804e585643'>mailmap: Adjust entries for ng0.</a><span class='msg-avail'>...</span></td><td>ng0</td></tr>
<tr><td><span title='2017-11-26 18:21:19 -0500'>2017-11-26</span></td><td><a href='/guix/commit/.mailmap?id=9221979e367a95c14a35236742792fb624d8e47c'>Update e-mail for ng0.</a><span class='msg-avail'>...</span></td><td>ng0</td></tr>
<tr><td><span title='2017-10-03 17:07:54 +0200'>2017-10-03</span></td><td><a href='/guix/commit/.mailmap?id=d109b1e85c5c1438e66dfc05ea4a018418edaf19'>Update e-mail for Theodoros Foradis.</a><span class='msg-avail'>...</span></td><td>Theodoros Foradis</td></tr>
<tr><td><span title='2017-08-29 20:13:24 -0400'>2017-08-29</span></td><td><a href='/guix/commit/.mailmap?id=3c8ba11a97d3f3b671b8919da8c41f0b0e2ccaf3'>Update e-mail for Kei Kebreau.</a><span class='msg-avail'>...</span></td><td>Kei Kebreau</td></tr>
<tr><td><span title='2017-08-13 16:11:48 -0400'>2017-08-13</span></td><td><a href='/guix/commit/.mailmap?id=79d5ad20e87066a0937a4b61a4857de2b34a7a30'>mailmap: fix entries for ng0.</a><span class='msg-avail'>...</span></td><td>ng0</td></tr>
<tr><td><span title='2017-06-16 15:48:17 +0300'>2017-06-16</span></td><td><a href='/guix/commit/.mailmap?id=a235ec3a6aa21980fe70e8d0c133e50986afbded'>mailmap: Adjust entries for ng0.</a><span class='msg-avail'>...</span></td><td>ng0</td></tr>
<tr><td><span title='2017-06-03 00:19:25 +0200'>2017-06-03</span></td><td><a href='/guix/commit/.mailmap?id=531191d4db957da81b940c73ade628865cb09e02'>.mailmap: Add another alias for ng0.</a><span class='msg-avail'>...</span></td><td>ng0</td></tr>