Remove unnecessary CMAKE_ variables from script invoke
The following variables should be removed from CMake running in script mode if possible:
CMAKE_SOURCE_DIR # seems to be set to CWD
CMAKE_BINARY_DIR # seems to be set to CWD
CMAKE_CURRENT_SOURCE_DIR # seems to be set to CWD
CMAKE_CURRENT_BINARY_DIR # seems to be set to CWD
CMAKE_FILES_DIRECTORY # set to /CMakeFiles