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>
<table class='tabs'><tr><td>
<a href='/guix/about/'>about</a><a href='/guix/'>summary</a><a href='/guix/refs/?id=8532564077dfe2fa56d8e0d0b39af8360a283dce'>refs</a><a class='active' href='/guix/log/gnu/system/examples'>log</a><a href='/guix/tree/gnu/system/examples?id=8532564077dfe2fa56d8e0d0b39af8360a283dce'>tree</a><a href='/guix/commit/gnu/system/examples?id=8532564077dfe2fa56d8e0d0b39af8360a283dce'>commit</a><a href='/guix/diff/gnu/system/examples?id=8532564077dfe2fa56d8e0d0b39af8360a283dce'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/gnu/system/examples'>
<input type='hidden' name='id' value='8532564077dfe2fa56d8e0d0b39af8360a283dce'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=8532564077dfe2fa56d8e0d0b39af8360a283dce'>root</a>/<a href='/guix/log/gnu?id=8532564077dfe2fa56d8e0d0b39af8360a283dce'>gnu</a>/<a href='/guix/log/gnu/system?id=8532564077dfe2fa56d8e0d0b39af8360a283dce'>system</a>/<a href='/guix/log/gnu/system/examples?id=8532564077dfe2fa56d8e0d0b39af8360a283dce'>examples</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/system/examples?id=8532564077dfe2fa56d8e0d0b39af8360a283dce&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2022-12-16 23:42:17 -0500'>2022-12-16</span></td><td><a href='/guix/commit/gnu/system/examples?id=491bddfa276cc9775adf325c07e5f82638f330e7'>system: examples: Add mode prop line.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/system/examples/asus-c201.tmpl: Add a mode prop line.
* gnu/system/examples/bare-bones.tmpl: Likewise.
* gnu/system/examples/beaglebone-black.tmpl: Likewise.
* gnu/system/examples/desktop.tmpl: Likewise.
* gnu/system/examples/docker-image.tmpl: Likewise.
* gnu/system/examples/lightweight-desktop.tmpl: Likewise.
* gnu/system/examples/raspberry-pi-64-nfs-root.tmpl: Likewise.
* gnu/system/examples/raspberry-pi-64.tmpl: Likewise.
* gnu/system/examples/vm-image.tmpl: Likewise.
</span></span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2022-12-12 15:03:35 +0100'>2022-12-12</span></td><td><a href='/guix/commit/gnu/system/examples?id=302a84a593e4be417d739caf4e5385df536e3943'>Merge branch 'version-1.4.0'</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2022-12-09 16:40:53 +0100'>2022-12-09</span></td><td><a href='/guix/commit/gnu/system/examples?id=755c4b496e24f2df5f1b0f4a3873e9e00bae1fdc'>system: Remove unused yggdrasil OS template.</a><span class='msg-avail'>...<span class='msg-tooltip'>This file was added in fe1cd098d2b83737e96f19438612291f5a9316e4 but it's
not referenced from anywhere, not even gnu/local.mk.  Furthermore, we
don't normally add full OS examples for the purposes of illustrating the
use of a single service.

* gnu/system/examples/yggdrasil.tmpl: Remove.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2022-12-04 00:37:11 -0500'>2022-12-04</span></td><td><a href='/guix/commit/gnu/system/examples?id=08dc9f2ca2e96476aa51c906c8ba01ca5d033568'>gnu: Do not use 'local-file' in Raspberry Pi OS examples.</a><span class='msg-avail'>...<span class='msg-tooltip'>As this breaks the 'tests/guix-system.sh' test.

* gnu/system/examples/raspberry-pi-64-nfs-root.tmpl (%my-public-key): Delete
variable.
(raspberry-pi-64-nfs-root) [services]: Remove key from openssh-configuration.
* gnu/system/examples/raspberry-pi-64.tmpl: Likewise.

Reported-by: Vagrant Cascadian &lt;vagrant@debian.org&gt;
</span></span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2022-12-01 14:31:29 -0500'>2022-12-01</span></td><td><a href='/guix/commit/gnu/system/examples?id=c7793b82efd3383a9f7adf0dfa82d71ee032e41b'>gnu: raspberry-pi: Add a bootloader-chain for the Raspberry Pi and os examples.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/raspberry-pi.scm (grub-efi-bootloader-chain-raspi-64): New
bootloader variable, capable to boot a Raspberry Pi over network or from a
local storage.
* gnu/system/examples/raspberry-pi-64.tmpl: New operating-system example.
* gnu/system/examples/raspberry-pi-64-nfs-root.tmpl: New operating-system
example for booting over network.
* Makefile.am (EXAMPLES): Register the new files.

Signed-off-by: Maxim Cournoyer &lt;maxim.cournoyer@gmail.com&gt;
</span></span></td><td>Stefan</td></tr>
<tr><td><span title='2022-10-23 02:00:06 +0200'>2022-10-23</span></td><td><a href='/guix/commit/gnu/system/examples?id=19f3dbcb4d4261b6d3813d36174b8ca6ac52d2ea'>system: Support bare-bones serial console.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/system/examples/bare-bones.tmpl (operating-system):
Add a ttyS0 console to kernel-arguments.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>