Update audio/musescore to latest upstream release
Musescore helps you create beautiful sheet music.
Release notes are at
https://musescore.org/en/3.6.1
https://musescore.org/en/node/316462
It's some crash fixes. FreeBSD ports skipped 3.6.0, which had lots more
changes and new sound fonts.
The port Makefile changes more than usual, because I took out
some REINPLACE_CMD and made regular patches from them. Also
MuseScore's CMake code is really weird, so it needs extra
patching to find libogg and such.