Hi,

I managed to build the krpc against KSP version 1.8.0.2686, 1.8.1.2694, and 1.9.0.2781 ¹.
Since those versions of ksp use unity version 2019.2.2f1 and unity separate UnityEngine.dll into multiple DLLs, it is required to modify build scripts thus build is incompatible to KSP version under 1.8.

If it's acceptable, I will open a pull request.

I'm not sure it's possible to modify build scripts to support all KSP versions from 1.2.2 to 1.9.0... I'm far from bazel experts. But if it's required, I may try.

Thanks,

A PR would be great!

And yeah I think we may just have to drop support for older versions of ksp. I don't see a way to support both versions of unity.