[Golly-test] Remove optional Perl support from Golly?

[Andrew T. <and...@gm...>]

It's currently possible to build a version of Golly that supports
running Perl scripts.  I doubt anybody is actually doing that
these days, especially given the problems we had trying to
keep up with ABI changes whenever a new version of Perl
was released, so I'd like to remove ALL Perl-related code.

This will simplify quite a lot of code, especially when Golly
tries to detect what type of script to run when the user
selects File > Run Clipboard. (Currently you can get a silly
message about Perl if you accidentally have RLE data
in the clipboard.)

Anybody here use Perl with Golly, or know someone who does?
Any objections to removing Perl as an option?

Andrew