Gmake projects needlessly rebuild due to flatbuffer generated files

[forrestthewoods]

The flatbuffers project generates flatc.exe. The protocol project has a data file "protocol.fbs". The protocol project has a pre-build step which runs flatbuffers/flatc on protocol.fbs to generate code.

Gmake constantly re-runs that operation which re-generates the same code but causes every dependency to be re-compiled.

I don't know how to fix this within makefiles. Then assuming that's fixed I don't know how to get GENie to generate said fix. It may require an update to the GENie project.