[CMake] [darwin] [builtins] Refactoring darwin_find_excluded_builtins_list to...

[CMake] [darwin] [builtins] Refactoring darwin_find_excluded_builtins_list to parse arguments instead of only handling positional arguments.

OS and ARCH must be specified, but minimum version may not. Excluding the minimum version will only apply the filters for builtins not supported by the OS and OS-Arch pair.

llvm-svn: 248543