[CMake] Fix suffix of Python module.

python/CMakeLists.txt

@@ -54,12 +54,7 @@ SET_TARGET_PROPERTIES(${LIBRARY_NAME} PROPERTIES
   PREFIX ""
   LIBRARY_OUTPUT_NAME ${LIBRARY_NAME})
 
-IF(APPLE)
-  # We need to change the extension for python bindings
-  SET_TARGET_PROPERTIES(${LIBRARY_NAME} PROPERTIES SUFFIX ".so")
-ELSEIF(WIN32)
-  SET_TARGET_PROPERTIES(${LIBRARY_NAME} PROPERTIES SUFFIX ".pyd")
-ENDIF(APPLE)
+SET_TARGET_PROPERTIES(${PROJECT_NAME} PROPERTIES SUFFIX "${PYTHON_EXT_SUFFIX}")
 
 INSTALL(TARGETS ${LIBRARY_NAME}
   DESTINATION ${PYTHON_SITELIB})