When building master with gcc 4.8, the build fails with errors like this:
error: no matching function for call to 'MediaPlayer2Player::connect(QPointer<PlayerManager>&, void (PlayerManager::*)(const FileHandle&), MediaPlayer2Player* const, void (MediaPlayer2Player::*)()const)'
See also https://bugreports.qt.io/browse/QTBUG-48988
This patch fixes it.
The fix is similar to fixes in other applications, e.g. https://cgit.kde.org/kdevelop.git/commit/?h=5.2&id=6d5bdbba0a04d7180bda1f6bb47acb386575a561