Is ww4_compile_config.yaml needed?

[JessicaMeixner-NOAA]

In WW3, we do not have to have a separate configurable yaml file for building. We do have to set some compiler variables. It's also unclear to me if/how ww4_compile_config.yaml is being used at this time because I did not have this file where https://github.com/NOAA-EMC/WW4/blob/develop/tools/README.md said to have it and I was able to build WW4.

[HendrikTolman-NOAA]

@JessicaMeixner-NOAA I am addressing issues #62, #63, and #64 simultaneously in https://github.com/HendrikTolman-NOAA/WW4_HLT/tree/FT-Cmake-only-compile-system . Please take a look if this is generally what you wanted before I create a PR.