Change Details

Fix swig 4 build failure and rebuild against python-protobuf 3.11.3.

Add a patch to fix github issue [1038](https://github.com/mypaint/mypaint/issues/1038) and rebuild against python-protobuf 3.11.3.

Fix swig 4 build failureAdd a patch to fix github issue [1038](https://github.com/mypaint/mypaint/issues/1038) and rebuild against python-protobuf 3.11.3.