[Chapel Merge] Improve error when cmake is missing

Branch: refs/heads/main
Revision: 195a375
Author: mppf
Link: Unavailable
Log Message:

Merge pull request #20200 from mppf/improve-cmake-missing-error

Improve error when cmake is missing

Adjust the error to indicate Chapel requires cmake, not just LLVM.

Reviewed by @daviditen - thanks!

Modified Files:
M third-party/llvm/Makefile

Compare: https://github.com/chapel-lang/chapel/compare/f2fff5e9ea9d...195a37574cd5