lang/clisp: Update and modernize

Other notable port changes:

• Change versioning scheme. Upstream commits new release such as 2.49.95+, but does not tag those releases.
• Remove broken options (GLIBC, JITC, MATLAB, NETICA, ORACLE, THREADS) and DOCS and NLS options.
• Add test target.
• Pet portclippy/portfmt.

PR: 283485
Approved by: maintainer timeout
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D48176