[llvm] [cmake] Exposes LLVM version number in the runtimes. (PR #84641)

[Mark de Wever via llvm-commits]

mordante wrote:

I originally used this in https://github.com/llvm/llvm-project/pull/81362, there it's not needed anymore. However @ldionne and I feel it would be useful to have this. We probably can use this to set the libc++ version number.

https://github.com/llvm/llvm-project/pull/84641