Remove some modules no longer needed.

Class::Std, Class::Std::Fast and TermReadyKey were installed for use
by SOAP::WSDL, which was removed in 4d077406. Return::Value was used
by Email::Send, removed in b26da0da.

The remainder are core modules that now have a minimal version which
is higher than what we require.

Other things that look to be removed but shouldn't:
* CGI and Module::Pluggable need to be packaged as these are removed
  from core in 5.22 and 5.20 respectively;
* MooseX::NonMoose is still needed for system Mac perl installation;
* Cpanel::JSON::XS/ Devel::GlobalDestruction::XS might be installed;
* CPAN::Meta::YAML, I'm not sure about but it seems to think that it
  already has a higher version installed than it does.

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