When building shared libs we set the OPENEXR_DLL define for windows only
When building shared libs we set the OPENEXR_DLL define for windows only

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