Remove some perl packages from base Perl bundle as they are already included

[Micket]

I encountered some compilation errors, and it turns out "threads" was already included in dist in Perl itself, and the CPAN package was actually outdated. We should just skip building those things that Perl already bundles by default.

See this commit for the things i dropped from the latest Perl
0bd94fe
Dunno if they actually cause harm to have them, but it seems a bit wrong, and is of course unnecessary steps.