BUG: remove duplicated line

CMakeExternals/PythonQt.cmake

@@ -44,7 +44,6 @@ IF(${add_project})
         -DQT_QMAKE_EXECUTABLE:FILEPATH=${QT_QMAKE_EXECUTABLE}
         -DPYTHON_INCLUDE_DIR:PATH=${PYTHON_INCLUDE_DIR}
         -DPYTHON_LIBRARY:FILEPATH=${PYTHON_LIBRARY}
-        -DPYTHON_LIBRARY:FILEPATH=${PYTHON_LIBRARY}
         -DPythonQt_Wrap_QtGui:BOOL=ON
       )
     SET(PYTHONQT_INSTALL_DIR ${ep_install_dir})