Switched to Perl local::lib for local compilation.

Taken from upstream Slic3r, thanks @alexrj.

t/dynamic.t

@@ -8,6 +8,7 @@ plan tests => 20;
 BEGIN {
     use FindBin;
     use lib "$FindBin::Bin/../lib";
+    use local::lib "$FindBin::Bin/../local-lib";
 }
 
 use List::Util qw(first);