Fix compilation with Qt 5.2.0, due to windowIcon() being in QApp still.
Fix compilation with Qt 5.2.0, due to windowIcon() being in QApp still.

(I moved it to QGuiApp in Qt 5.3).

It's not like this code is QtGui only anyway, there's a QMessageBox.

KDE/phonon-vlc,BinChengfei/phonon-vlc,KDE/phonon-vlc,BinChengfei/phonon-vlc,KDE/phonon-vlc,BinChengfei/phonon-vlc