audio/abcde: Drop Perl build dependency
There is no opt_USE_PERL5 helper.
While here convert pkg-message to UCL. Remove the hint about
upgrading from abcde-2.1.4 or older. 2.1.5 is from 2003 so that
hint is probably no longer relevant.
Update to upstream version 2.7
- General port cleanup
- Apply FreeBSD-specific modifications to make it
work out of the box more conveniently
PR: 201837
Submitted by: tkato432@yahoo.com