Support Perl 5.6.1, 5.6.2, and 5.8.x (where x < 5)

[tobyink]

Would be really nice to have support for those.

Yes, I know cpanm doesn't work on Perl older than 5.8.1, so the classic CPAN client would need to be used there.

[tobyink]

Actually cpanm is really easy to get working on Perl 5.6.

Here's an example of a working cpanm for Perl 5.6. (Tested on 5.6.1 and 5.6.2.)

https://gist.github.com/tobyink/c7a1001f39d90c3ff76400b13183b268

A summary of changes:

• print$fh JSON::PP::encode_json($local) needs to be changed to print {$fh} JSON::PP::encode_json($local) — this is just one place in the fatpacked App::cpanminus::script.
• use 5.008001 needs to be changed to use 5.006 in fatpacked CPAN::Meta::YAML.
• In fatpacked App::cpanminus::script, where it calls GetOptions, the q|quiet! option should be changed to q|quiet, n|notest! changed to n|notest and S|sudo! changed to S|sudo. This means that --no-prefixed versions of those options stop working, but they're already false by default.

So if actions-setup-perl could install a patched version of cpanm with the above fixes, this would make testing on Perl 5.6 work beautifully.

[shogo82148]

fixed by #481 and #453