[CMake] [Darwin] [builtins] Make CMake re-generate if the builtin filter lists change.

We need to make sure that if you change the builtin filter lists CMake re-generates its configurations so it includes the right builtins in the generated libraries.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@248852 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed