Fixing build with gcc 4.5

http://bugs.gentoo.org/show_bug.cgi?id=318579

--- src/MyMainWindow.cpp
+++ src/MyMainWindow.cpp
@@ -219,7 +219,7 @@
 
 		// Creating the toolbar
 		MainToolBar = addToolBar( tr( "Main Toolbar" ) );
-		MainToolBar->setIconSize( QSize::QSize( 16, 16 ) );
+		MainToolBar->setIconSize( QSize( 16, 16 ) );
 		MainToolBar->setAllowedAreas( Qt::TopToolBarArea );
 		MainToolBar->setMovable( false );