cmake PYTHON_HAS_DASH_B_RESULT examples

BastilleResearch/gr-lora cmake/Modules/GrPython.cmake :63

execute_process(
        COMMAND ${PYTHON_EXECUTABLE} -B -c ""
        OUTPUT_QUIET ERROR_QUIET
        RESULT_VARIABLE PYTHON_HAS_DASH_B_RESULT
    )

analogdevicesinc/gr-iio cmake/Modules/GrPython.cmake :56

execute_process(
        COMMAND ${PYTHON_EXECUTABLE} -B -c ""
        OUTPUT_QUIET ERROR_QUIET
        RESULT_VARIABLE PYTHON_HAS_DASH_B_RESULT
    )