Seeking feedback: potential cmake build dependency

We are considering introducing cmake version >= 3.13.4 (Feb 2019) as a build requirement for building the chapel compiler from source and are seeking community feedback on what potential issues and impact this may cause.

While this is not a very new version of cmake, we understand that many users build chpl from source on HPC machines which sometimes presents challenges with dependencies.

We are interested in any responses -- whether positive or negative -- so that we can make an informed decision. Thank you!

I'm on cmake 3.15 on my local hpc cluster so no problem.

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