main/protobuf: upgrade to 3.18.1
remove musl-fix.patch, fixed upstream remove skip-failing-tests.patch, not needed refactor trim-rakefile.patch and ruby-fix-cflags.patch
Edited by Milan P. Stanić
remove musl-fix.patch, fixed upstream remove skip-failing-tests.patch, not needed refactor trim-rakefile.patch and ruby-fix-cflags.patch