CMake clean up to more closey match that of the autoconfgure one.
CMake clean up to more closey match that of the autoconfgure one.

oglops/PyIlmBase,oglops/OpenEXR,oglops/IlmBase,oglops/PyIlmBase,oglops/IlmBase,oglops/OpenEXR,oglops/PyIlmBase,oglops/OpenEXR,oglops/PyIlmBase,oglops/IlmBase