GENERATOR_EXTRA_FLAGS must be a cmake string, not a cmake list.
GENERATOR_EXTRA_FLAGS must be a cmake string, not a cmake list.

Reviewer: Luciano Wolf <c353ae890f0e6de8473e43011f009ccd38a3c452@openbossa.org>
          Marcelo Lira <marcelo.lira@openbossa.org>

enthought/pyside,pankajp/pyside,IronManMark20/pyside2,RobinD42/pyside,IronManMark20/pyside2,M4rtinK/pyside-android,RobinD42/pyside,gbaty/pyside2,BadSingleton/pyside2,IronManMark20/pyside2,IronManMark20/pyside2,RobinD42/pyside,IronManMark20/pyside2,PySide/PySide,M4rtinK/pyside-bb10,qtproject/pyside-pyside,PySide/PySide,M4rtinK/pyside-bb10,RobinD42/pyside,PySide/PySide,qtproject/pyside-pyside,BadSingleton/pyside2,BadSingleton/pyside2,qtproject/pyside-pyside,gbaty/pyside2,gbaty/pyside2,M4rtinK/pyside-android,enthought/pyside,enthought/pyside,M4rtinK/pyside-bb10,M4rtinK/pyside-bb10,gbaty/pyside2,BadSingleton/pyside2,qtproject/pyside-pyside,M4rtinK/pyside-android,M4rtinK/pyside-bb10,enthought/pyside,pankajp/pyside,PySide/PySide,pankajp/pyside,gbaty/pyside2,qtproject/pyside-pyside,PySide/PySide,BadSingleton/pyside2,M4rtinK/pyside-android,RobinD42/pyside,enthought/pyside,pankajp/pyside,enthought/pyside,RobinD42/pyside,pankajp/pyside,M4rtinK/pyside-bb10,enthought/pyside,M4rtinK/pyside-android,RobinD42/pyside,M4rtinK/pyside-android