How to build/test changes in the compiler/runtimes?
It seems that the algorithm, outlined by me in the https://github.com/kaitai-io/kaitai_struct_doc/pull/31, no longer works because there is no script `build-jvm-compiler` (which is called from `tests/build-compiler`) in the project tree. So I can't test my changes in https://github.com/kaitai-io/kaitai_struct_compiler/pull/197.

@GreyCat, @generalmimon, can you assist me in testing my changes?