python screen windows without context sharing

Globals.h

@@ -188,6 +188,7 @@ struct global_settings {
 	bool python_displaywindows = false;
 	bool python_threadedupload = true;
 	bool python_vsync = true;
+	bool python_sharectx = false;
 
     int gfx_framebuffer_width = -1;
     int gfx_framebuffer_height = -1;