Update cx_check_func_swap_all.cmake
Newer version of XCode prefer _OSSwapInt16, _OSSwapInt32, and _OSSwapInt64 over OSSwap16, OSSwap32, and OSSwapInt64
Newer version of XCode prefer _OSSwapInt16, _OSSwapInt32, and _OSSwapInt64 over OSSwap16, OSSwap32, and OSSwapInt64