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;='submit' value='switch'/></form></td></tr>
<tr><td class='sub'>Wojtek's customized Guix</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=7937c8827b8d23347a3159b4696335bd19fc17aa'>refs</a><a class='active' href='/guix/log/gnu/packages/patches/dune-grid-add-missing-include-cassert.patch'>log</a><a href='/guix/tree/gnu/packages/patches/dune-grid-add-missing-include-cassert.patch?id=7937c8827b8d23347a3159b4696335bd19fc17aa'>tree</a><a href='/guix/commit/gnu/packages/patches/dune-grid-add-missing-include-cassert.patch?id=7937c8827b8d23347a3159b4696335bd19fc17aa'>commit</a><a href='/guix/diff/gnu/packages/patches/dune-grid-add-missing-include-cassert.patch?id=7937c8827b8d23347a3159b4696335bd19fc17aa'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/gnu/packages/patches/dune-grid-add-missing-include-cassert.patch'>
<input type='hidden' name='id' value='7937c8827b8d23347a3159b4696335bd19fc17aa'/><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=7937c8827b8d23347a3159b4696335bd19fc17aa'>root</a>/<a href='/guix/log/gnu?id=7937c8827b8d23347a3159b4696335bd19fc17aa'>gnu</a>/<a href='/guix/log/gnu/packages?id=7937c8827b8d23347a3159b4696335bd19fc17aa'>packages</a>/<a href='/guix/log/gnu/packages/patches?id=7937c8827b8d23347a3159b4696335bd19fc17aa'>patches</a>/<a href='/guix/log/gnu/packages/patches/dune-grid-add-missing-include-cassert.patch?id=7937c8827b8d23347a3159b4696335bd19fc17aa'>dune-grid-add-missing-include-cassert.patch</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/patches/dune-grid-add-missing-include-cassert.patch?id=7937c8827b8d23347a3159b4696335bd19fc17aa&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2023-05-02 11:57:55 +0200'>2023-05-02</span></td><td><a href='/guix/commit/gnu/packages/patches/dune-grid-add-missing-include-cassert.patch?id=2667b838c891e491a848eedfb5c1699dc25afe21'>gnu: dune-grid: Update to 2.9.0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/maths.scm (dune-grid): Update to 2.9.0.
  [source](patches): Add patch to fix build.
* gnu/packages/patches/dune-grid-add-missing-include-cassert.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.

Signed-off-by: Ludovic Courtès &lt;ludo@gnu.org&gt;
</span></span></td><td>Felix Gruber</td></tr>