gplugin/gplugin

Remove Perl5 support

21 months ago, Gary Kramlich
725422517004
Remove Perl5 support

This was originally added to keep feature parity with purple2, but it has been
a huge pain, there's no solution on macOS, it randomly breaks, and there never
really was a lot of adoption of it in purple2.

Also the IEEE and Stack Overflow surveys from 2022 have Perl ranked between the
20th and 30th most popular programming language so I feel comfortable remove it.

If necessary we can always pull back out of version control and bring it back up
to date.

Testing Done:
Compiled

Reviewed at https://reviews.imfreedom.org/r/1793/
The following individuals have contributed to this project.
Ankit Vani <a@nevitus.org>
EionRobb <eion@robbmob.com>
Elliott Sales de Andrade <quantum.analyst@gmail.com>
Gary Kramlich <grim@reaperworld.com>
Jason Scherer <schereja@gmail.com>
John Bailey <rekkanoryo@rekkanoryo.org>
Mike Ruprecht <cmaiku@gmail.com>
Olaf Hering <olaf@aepfle.de>
Paul Jimenez <pj@place.org>
Richard Laager <rlaager@pidgin.im>
Sorvival <sorvival@tutanota.com>
ivanhoe <ivanhoe@fiscari.de>