tweak CMAKE_SWIG_FLAGS; add -keyword to make keyword arguments work again
tweak CMAKE_SWIG_FLAGS; add -keyword to make keyword arguments work again

Thank you for pointing that out, Niektory! 
Ref. https://github.com/fifengine/fifengine/pull/1019#issuecomment-285992606
fifengine/fifengine,fifengine/fifengine,fifengine/fifengine