textproc/rasqal: Various improvements

• Remove SF master site. It's no longer updated.
• Bring pkg-descr, COMMENT, and WWW in line with upstream.
• Depend on libgcrypt to support more SPARQL hash functions than MD5 and SHA1.
• Remove dependency on libpcre (deprecated). Use libc POSIX regular expressions instead.
• Add --with-uuid-library=internal so we don't accidentally link with libuuid.
• Strip the library.
• Enable tests.
• Add DOCS option.
• Enable MPFR option by default and turn the RADIO group into a SINGLE so the "none" case can be described because it's nonconforming. XSD requires 18 decimals and double precision only has 15.
• Pet portclippy.

PR: 280079