Workaround a bug on Mac OS in witch dolphin would crash whenthe OpenGL config window would be opened. It seems that wxDialog::Center() is completely useless on Mac OS X, and not only useless, but it crashes when the window is bigger than the screen.

git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@5911 8ced0084-cf51-0410-be5f-012b33b47a6e

Source/Plugins/Plugin_VideoOGL/Src/GUI/ConfigDlg.cpp

@@ -527,7 +527,9 @@ void GFXConfigDialogOGL::CreateGUIControls()
 	InitializeGUITooltips();
 
 	Fit();
-	Center();
+#ifndef __APPLE__
+	Center(); //it seems to cause problems on macs with small screens
+#endif
 	UpdateGUI();
 }