Fix channel filtering not working.

Channel filtering broke for windows Snapshots delivered with Qt 5
due to a signature change on the QAbstractView::dataChanged function
overridden in UserView to implement the channel filtering functionality.
See http://qt-project.org/doc/qt-5/sourcebreaks.html#changes-to-qt-widgets .

Fixes #1328 .

src/mumble/UserView.cpp

@@ -385,7 +385,11 @@ void UserView::updateChannel(const QModelIndex &idx) {
 	}
 }
 
-void UserView::dataChanged ( const QModelIndex & topLeft, const QModelIndex & bottomRight )
+#if QT_VERSION >= QT_VERSION_CHECK(5, 0, 0)
+void UserView::dataChanged ( const QModelIndex & topLeft, const QModelIndex & bottomRight, const QVector<int> &)
+#else
+void UserView::dataChanged ( const QModelIndex & topLeft, const QModelIndex & bottomRight)
+#endif
 {
 	UserModel *um = static_cast<UserModel *>(model());
 	int nRowCount = um->rowCount();

src/mumble/UserView.h

@@ -77,10 +77,15 @@ class UserView : public QTreeView {
 	public:
 		UserView(QWidget *);
 		void keyboardSearch(const QString &search);
+#if QT_VERSION >= QT_VERSION_CHECK(5, 0, 0)
+		void dataChanged(const QModelIndex & topLeft, const QModelIndex & bottomRight, const QVector<int> & roles = QVector<int> ());
+#else
+		void dataChanged(const QModelIndex & topLeft, const QModelIndex & bottomRight);
+#endif
+
 	public slots:
 		void nodeActivated(const QModelIndex &idx);
 		void selectSearchResult();
-		void dataChanged(const QModelIndex & topLeft, const QModelIndex & bottomRight);
 		void updateChannel(const QModelIndex &index);
 };