Qt4: Unneeded includes.

(cherry picked from commit 88565227)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

modules/gui/qt4/components/preferences_widgets.hpp

@@ -49,7 +49,6 @@
 #include <QDialog>
 
 
-class QFile;
 class QTreeWidget;
 class QTreeWidgetItem;
 class QGroupBox;

modules/gui/qt4/components/simple_preferences.cpp

@@ -37,7 +37,6 @@
 #include <QFont>
 #include <QToolButton>
 #include <QButtonGroup>
-#include <QUrl>
 #include <QVBoxLayout>
 
 #include <QtAlgorithms>

modules/gui/qt4/dialogs/gototime.cpp

@@ -31,7 +31,6 @@
 #include "input_manager.hpp"
 
 #include <QTabWidget>
-#include <QFile>
 #include <QLabel>
 #include <QTimeEdit>
 #include <QGroupBox>

modules/gui/qt4/dialogs/help.cpp

@@ -41,7 +41,6 @@
 
 #include <QTextBrowser>
 #include <QTabWidget>
-#include <QFile>
 #include <QLabel>
 #include <QString>
 #include <QDialogButtonBox>