Fixes warnings with protobuf >= 3.8.0:
> The optimize_for = LITE_RUNTIME option is no longer supported by protobuf
> Java code generator and is ignored--protoc will always generate full
> runtime code for Java. To use Java Lite runtime, users should use the
> Java Lite plugin instead. See:
> https://github.com/protocolbuffers/protobuf/blob/master/java/lite.md
No encoder has ever supported bzip2 or lzma. bzip2 has a poor
time/compression ratio, so obsolete it right now. lzma can be
considered for future use, so indicate it as a proposed extension.
Jochen Topf