[llvm] [openmp] Deprecate LLVM_ENABLE_PROJECTS in favor of LLVM_ENABLE_RUNTIMES (PR #124711)

[Jan Patrick Lehr via llvm-commits]

jplehr wrote:

Thank you for putting this up. I think I understand the motivation, however, from the issue you linked, I do not get the sense of urgent and strong support of this direction right now. I also wondered who "we" refers to.

I think this should be discussed a bit more, and I do not see the need to put us on this tight timeline right away.

https://github.com/llvm/llvm-project/pull/124711