print/lilypond-devel: Update to 2.21.1
- Update 2.21.1
- Switch to python3 and un-expire
- Use clang again for building instead of gcc
- Clean up/regenerate patches
- Move gettext to the NLS knoob
PR: 246112
Submitted by: m.ne@gmx.net (maintainer)
Approved by: tcberner (mentor)
Differential Revision: https://reviews.freebsd.org/D24665