Fix the audio/musescore update.

• add missing patch file
• change WebEngine to an option, unbreak (hopefully the code is ok) on aarch64 and ppc64

Should have mentioned that the release notes for 3.0.0 are at
https://musescore.org/en/handbook/developers-handbook/release-notes/release-notes-musescore-3
But that, plus the versions 2.2, 2.2.1, 2.3, 2.3.1 and 2.3.2 that
were skipped in ports are too many to summarize here.

PR: 234801