Make quiet Python 3 check

if(CMAKE_VERSION VERSION_LESS 3.12)

    find_package(PythonInterp) # Deprecated since version 3.12

    find_package(PythonInterp 3.5 QUIET) # Deprecated since version 3.12

    if(PYTHONINTERP_FOUND)

        set(Python_EXECUTABLE ${PYTHON_EXECUTABLE})

        set(Python3_EXECUTABLE ${PYTHON_EXECUTABLE})

        set(Python3_VERSION ${PYTHON_VERSION_STRING})

    endif()

else()

    find_package(Python COMPONENTS Interpreter)

    find_package(Python3 COMPONENTS Interpreter QUIET)

endif()

if (Python_EXECUTABLE)

if (Python3_EXECUTABLE)

    if(Python3_VERSION VERSION_GREATER_EQUAL 3.5)

        add_custom_target(

          check-whitespace

      ${Python_EXECUTABLE} ${LAMMPS_TOOLS_DIR}/coding_standard/whitespace.py .

          ${Python3_EXECUTABLE} ${LAMMPS_TOOLS_DIR}/coding_standard/whitespace.py .

          WORKING_DIRECTORY  ${LAMMPS_DIR}

          COMMENT "Check for whitespace errors")

        add_custom_target(

          fix-whitespace

      ${Python_EXECUTABLE} ${LAMMPS_TOOLS_DIR}/coding_standard/whitespace.py -f .

          ${Python3_EXECUTABLE} ${LAMMPS_TOOLS_DIR}/coding_standard/whitespace.py -f .

          WORKING_DIRECTORY  ${LAMMPS_DIR}

          COMMENT "Fix whitespace errors")

    endif()

endif()