OSX/CI: khangman fails to build on branch frameworks

[Marko Käning]

I huess khangman isn’t fully ported yet and I don’t need to be bothered
trying to get it to build on OSX/CI, right?

---

-- Performing Test COMPILER_HAS_DEPRECATED_ATTR - Success
CMake Error at src/engine/CMakeLists.txt:89 (set_target_properties):
  set_target_properties Can not find target to add properties to:
  KHangManEngine


CMake Error at src/engine/CMakeLists.txt:90 (set_target_properties):
  set_target_properties Can not find target to add properties to:
  KHangManEngine


CMake Error at src/engine/CMakeLists.txt:91 (set_target_properties):
  set_target_properties Can not find target to add properties to:
  KHangManEngine


-- Configuring incomplete, errors occurred!