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;</td><td class='sub right'></td></tr></table>
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<tr><td><span title='2021-06-26 22:46:09 +0200'>2021-06-26</span></td><td><a href='/guix/commit/gnu/packages/php.scm?id=68e378913914f35e40b05108c709f4d1eb55b18a'>gnu: php: Build sodium.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/php.scm (php): Build sodium extension.

Signed-off-by: Ludovic Courtès &lt;ludo@gnu.org&gt;
</span></span></td><td>Aljosha Papsch</td></tr>
<tr><td><span title='2021-06-03 18:23:39 +0200'>2021-06-03</span></td><td><a href='/guix/commit/gnu/packages/php.scm?id=0e8d650c4f578a27b30891751780b75239ffd3f8'>gnu: php: Update to 7.4.20.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/php.scm (php): Update to 7.4.20.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2021-05-06 13:56:26 +0200'>2021-05-06</span></td><td><a href='/guix/commit/gnu/packages/php.scm?id=1ebbf76862b01c92e6d6289612b66599e71ceaf3'>gnu: php: Update to 7.4.19.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/php.scm (php): Update to 7.4.19.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2021-05-01 11:29:11 +0200'>2021-05-01</span></td><td><a href='/guix/commit/gnu/packages/php.scm?id=9b74cfd16140b971d58dc5ae77ef8f8e98c5b47f'>gnu: php: Update to 7.4.18.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/php.scm (php): Update to 7.4.18.
[arguments]: Delete yet another failing test (proc_nice_basic).
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2021-03-05 16:12:31 +0100'>2021-03-05</span></td><td><a href='/guix/commit/gnu/packages/php.scm?id=81aa2fa4ae8fda14dd900ca07559f809ab3354b9'>gnu: php: Update to 7.4.16 [security fixes].</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/php.scm (php): Update to 7.4.16.
[arguments]: Patch failing new test.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2021-02-26 12:57:53 +0100'>2021-02-26</span></td><td><a href='/guix/commit/gnu/packages/php.scm?id=8753bb4192410e6cd81a4072c1dd5f2ff822320e'>gnu: php: Disable failing test on Arm.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/php.scm (php): Disable timing sensitive failing test on Arm.
</span></span></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2021-02-09 17:09:49 +0100'>2021-02-09</span></td><td><a href='/guix/commit/gnu/packages/php.scm?id=f2130228ed86fed81806a662ed59aa74ed2398ed'>gnu: php: Disable failing tests on arm.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/php.scm (arguments)[phases]: Disable additional failing
tests on arm.
</span></span></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2021-02-08 16:36:21 +0100'>2021-02-08</span></td><td><a href='/guix/commit/gnu/packages/php.scm?id=48650b0c3569222d53d29320ba97343dc4ef8038'>gnu: php: Update to 7.4.15.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/php.scm (php): Update to 7.4.15.
</span></span></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2021-01-07 17:18:05 +0100'>2021-01-07</span></td><td><a href='/guix/commit/gnu/packages/php.scm?id=d033540e6c113323089403a26e39f9a288c9c857'>gnu: php: Update to 7.4.14.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/php.scm (php): Update to 7.4.14.
</span></span></td><td>Julien Lepiller</td></tr>