Fix annoying CMP0042 warning in CMake on Mac OS X
Fix annoying CMP0042 warning in CMake on Mac OS X

Honestly, I don't know much about RPATH stuff on Mac OS X. That's something I
have to read more about later, for now just make it stop complaining.

Koromix/ty,Koromix/ty,Koromix/tytools,Koromix/ty,Koromix/tytools,Koromix/tytools