audio/hydrogen: Update to 1.2.6 and move to QT6
Additional changes to submitted patch:
- Remove dead MASTER_SITES
- Remove DEBUG option, rely on framework instead
- Disable autodetection of Doxygen
- Don't override framework optimization
- Small changes to port Makefile Use DISTVERSION consistently Remove redundant LDFLAGS definitons Minor Makefile layout changes to more closely follow Porters Handbook
References:
https://docs.freebsd.org/en/books/porters-handbook/book/#dads-cflags
Changelog: https://github.com/hydrogen-music/hydrogen/releases/tag/1.2.6
PR: 289524