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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<div class='path'>path: <a href='/guix/log/?id=7fdd112815dc7290860baa6e39ea2fd50c9ed262&amp;showmsg=1'>root</a>/<a href='/guix/log/gnu?id=7fdd112815dc7290860baa6e39ea2fd50c9ed262&amp;showmsg=1'>gnu</a>/<a href='/guix/log/gnu/packages?id=7fdd112815dc7290860baa6e39ea2fd50c9ed262&amp;showmsg=1'>packages</a>/<a href='/guix/log/gnu/packages/augeas.scm?id=7fdd112815dc7290860baa6e39ea2fd50c9ed262&amp;showmsg=1'>augeas.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/augeas.scm?id=7fdd112815dc7290860baa6e39ea2fd50c9ed262'>Collapse</a>)</th><th class='left'>Author</th></tr>
<tr class='logheader'><td><span title='2020-04-16 19:42:20 +0200'>2020-04-16</span></td><td class='logsubject'><a href='/guix/commit/gnu/packages/augeas.scm?id=9fcd4ef30bd17d6ab66d7ee14d2e74081efcfb29'>gnu: augeas: Use HTTPS home page.</a></td><td>Tobias Geerinckx-Rice</td></tr>
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* gnu/packages/augeas.scm (augeas)[home-page]: Use HTTPS.


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<tr class='logheader'><td><span title='2020-04-16 19:42:20 +0200'>2020-04-16</span></td><td class='logsubject'><a href='/guix/commit/gnu/packages/augeas.scm?id=53b655727e4acb55f4174cbe9101f032453dba95'>gnu: augeas: Update to 1.12.0.</a></td><td>Tobias Geerinckx-Rice</td></tr>
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* gnu/packages/augeas.scm (augeas): Update to 1.12.0.


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