CMake: Turn MACOSX_RPATH ON for msdfgen;
CMake: Turn MACOSX_RPATH ON for msdfgen;

I think it's off because it's targeting an older version of CMake
or something.  There was a warning about CMP0042 as well.

bjornbytes/lovr,bjornbytes/lovr,bjornbytes/lovr,bjornbytes/lovr,bjornbytes/lovr