www/gallery-dl: Use upstream release tarball
- Add LICENSE_FILE
- Add USE_PYTHON=noflavors
- Convert to USE_PYTHON=pep517
- Fix 'make test' (after using release tarball)
- Bump PORTREVISION for package change
The release tarball includes generated manpages and completion files.
PR: 290610
Approved by: jbeich (maintainer)