Qt: compile extensions on Qt4.4

modules/gui/qt4/dialogs/extensions.cpp

@@ -175,8 +175,13 @@ ExtensionDialog::ExtensionDialog( intf_thread_t *_p_intf,
     assert( p_dialog );
 
     msg_Dbg( p_intf, "Creating a new dialog: '%s'", p_dialog->psz_title );
+#if HAS_QT45
     this->setWindowFlags( Qt::WindowMinMaxButtonsHint
                         | Qt::WindowCloseButtonHint );
+#else
+    this->setWindowFlags( Qt::WindowMinMaxButtonsHint
+#endif
+
     this->setWindowTitle( qfu( p_dialog->psz_title ) );
 
     layout = new QGridLayout( this );

modules/gui/qt4/qt4.hpp

@@ -42,6 +42,8 @@
 # error Please update Qt version to 4.5.1. 4.5.0 is too buggy
 #endif
 
+#define HAS_QT45 ( QT_VERSION >= 0x040500 )
+
 enum {
     QT_NORMAL_MODE = 0,
     QT_ALWAYS_VIDEO_MODE,