[PATCH][CMake] Fix PR14200, llvm-config output misses -fno-rtti

[David Wiberg]

Hi,

I took a stab at solving PR14200. My CMake knowledge is low but I think the
solution is reasonable as it reuses the existing logic for setting flags.

Things worth noting during review:
- The change means that both RTTI and exception handling flags will be
reported by llvm-config.
- I'm creating a variable with the same name as a target property. I don't
know if this breaks any convention.

I do not have commit access, so if patch is accepted I would appreciate
help with that part.

Best regards
David
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