Leave protobuf-java out of shaded compilerplugin.
Leave protobuf-java out of shaded compilerplugin.

It is causing problems with custom generators. Let's look for a solution
that does not involve shading, like forking a new JVM.

scalapb/ScalaPB,scalapb/ScalaPB,scalapb/ScalaPB,scalapb/ScalaPB,dotty-staging/ScalaPB,trueaccord/ScalaPB