- Remove QT4 ifdefs from interfaces

libs_required/ACG/QtWidgets/QtGLGraphicsScene.cc

libs_required/ACG/Scenegraph/TextNode.cc

widgets/aboutWidget/aboutWidget.hh

widgets/addEmptyWidget/addEmptyWidget.hh

widgets/glWidget/QtBaseViewer.cc

widgets/glWidget/QtBaseViewer.hh

widgets/glWidget/QtBaseViewerPicking.cc

widgets/glWidget/QtGLGraphicsScene.cc

widgets/glWidget/simpleGLGraphicsScene.cc

widgets/rendererWidget/TextBrowserWidget.cc

widgets/rendererWidget/renderObjectHighLighter.cc

widgets/rendererWidget/rendererObjectWidget.cc

widgets/rendererWidget/rendererWidget.cc

widgets/snapshotDialog/SnapshotDialog.hh

widgets/stereoSettingsWidget/stereoSettingsWidget.hh

widgets/videoCaptureDialog/VideoCaptureDialog.hh