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=e4b5a23841bc6a92e2e21dd8b1038addee55eb02'>root</a>/<a href='/guix/log/etc?id=e4b5a23841bc6a92e2e21dd8b1038addee55eb02'>etc</a>/<a href='/guix/log/etc/guix-daemon.cil.in?id=e4b5a23841bc6a92e2e21dd8b1038addee55eb02'>guix-daemon.cil.in</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/etc/guix-daemon.cil.in?id=e4b5a23841bc6a92e2e21dd8b1038addee55eb02&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2021-05-22 19:53:17 +0200'>2021-05-22</span></td><td><a href='/guix/commit/etc/guix-daemon.cil.in?id=35bd94a49257bbadcb3ca25342e5c1ec33f438f0'>etc: Add more SELinux permissions for the daemon.</a><span class='msg-avail'>...<span class='msg-tooltip'>* etc/guix-daemon.cil.in (guix_daemon): Add more permissions, necessary for
garbage collection.
</span></span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2020-12-10 23:48:42 +0100'>2020-12-10</span></td><td><a href='/guix/commit/etc/guix-daemon.cil.in?id=d677f3d6231d352fdb65b70f67d85fb5744e912c'>etc: Add more SELinux permissions for the daemon.</a><span class='msg-avail'>...<span class='msg-tooltip'>* etc/guix-daemon.cil.in (guix_daemon): Permit file write, getattr, link and
unlink for the guix_daemon_exec_t type.
</span></span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2020-11-27 21:33:59 +0100'>2020-11-27</span></td><td><a href='/guix/commit/etc/guix-daemon.cil.in?id=1807632393d0723f3085c457517965c32715717a'>etc: Add more SELinux permissions for the daemon.</a><span class='msg-avail'>...<span class='msg-tooltip'>* etc/guix-daemon.cil.in (guix_daemon): Permit more operations required for
various build jobs.
</span></span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2020-11-26 00:31:47 +0100'>2020-11-26</span></td><td><a href='/guix/commit/etc/guix-daemon.cil.in?id=402ebffe195890c9826cfa7519034dd12a48ae6a'>etc: Add more SELinux permissions for the daemon.</a><span class='msg-avail'>...<span class='msg-tooltip'>* etc/guix-daemon.cil.in (guix_daemon): Permit file appending, setattr,
read/write UDP sockets, access to tmpfs and hugetlbfs, and connecting to
PostgreSQL.
</span></span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2020-11-25 23:24:52 +0100'>2020-11-25</span></td><td><a href='/guix/commit/etc/guix-daemon.cil.in?id=d64e0261d0007413a795c4cf01f9d06b170da3f5'>etc: Add more SELinux permissions for the daemon.</a><span class='msg-avail'>...<span class='msg-tooltip'>This is needed for some package test suites.

* etc/guix-daemon.cil.in (guix_daemon): Permit unix_dgram_socket operations.
</span></span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2020-11-15 16:08:47 +0100'>2020-11-15</span></td><td><a href='/guix/commit/etc/guix-daemon.cil.in?id=62343288ef6dc56027d268ef773ae699a4bbb76d'>etc: Updates for the guix-daemon SELinux policy.</a><span class='msg-avail'>...<span class='msg-tooltip'>* etc/guix-daemon.cil.in (guix_daemon): Specify more permissions for
guix-daemon to account for daemon updates and newer SELinux.

I can't promise that this is a complete list of everything that guix-daemon
needs, but it's probably most of them. It can search for, install, upgrade,
and remove packages, create virtual machines and containers, update itself,
and so on.

Signed-off-by: Marius Bakke &lt;marius@gnu.org&gt;
</span></span></td><td>Daniel Brooks</td></tr>
<tr><td><span title='2019-09-08 11:49:25 +0200'>2019-09-08</span></td><td><a href='/guix/commit/etc/guix-daemon.cil.in?id=cc98b00857e29074de96a6ed60e325cdfffaea1a'>etc: Remove references to libexec/guix* from SELinux policy.</a><span class='msg-avail'>...<span class='msg-tooltip'>* etc/guix-daemon.cil.in: Remove references to libexec/guix*.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-02-07 15:41:23 +0100'>2018-02-07</span></td><td><a href='/guix/commit/etc/guix-daemon.cil.in?id=b617a9fe239ea645c816d6afcb81d5476f760d84'>etc: Add SELinux policy for the daemon.</a><span class='msg-avail'>...<span class='msg-tooltip'>* etc/guix-daemon.cil.in: New file.
* Makefile.am (dist_selinux_policy_DATA): Define it.
* configure.ac: Handle --with-selinux-policy-dir.
* doc/guix.texi (SELinux Support): New section.
</span></span></td><td>Ricardo Wurmus</td></tr>