Work in progress: Good bye, Perl Threads!

xs/lib/Slic3r/XS.pm

@@ -239,23 +239,16 @@ sub new {
     );
 }
 
-package Slic3r::GUI::_3DScene::GLShader;
-sub CLONE_SKIP { 1 }
-
 package Slic3r::GUI::_3DScene::GLVolume::Collection;
 use overload
     '@{}' => sub { $_[0]->arrayref },
     'fallback' => 1;
 
-sub CLONE_SKIP { 1 }
-
 package Slic3r::GUI::PresetCollection;
 use overload
     '@{}' => sub { $_[0]->arrayref },
     'fallback' => 1;
 
-sub CLONE_SKIP { 1 }
-
 package main;
 for my $class (qw(
         Slic3r::BridgeDetector