[llvm] [llvm][cmake] Remove version number from runtimes in PROJECTS warnings (PR #152457)

[David Spickett via llvm-commits]

DavidSpickett wrote:

I think it makes sense to have this on main as well in case nothing changes in the 22 timeframe, so this PR targets main first and I'll backport if accepted.

https://github.com/llvm/llvm-project/pull/152457