Fix #34997: when starting the game engine in one window and switching to a second

window, the game would stop drawing in the first and mess up the OpenGL state of
the second.

Also fixes glPushAttrib/glPopAttrib getting out of sync in some cases.

source/gameengine/BlenderRoutines/KX_BlenderGL.cpp

@@ -93,6 +93,11 @@ void BL_SwapBuffers(wmWindow *win)
 	wm_window_swap_buffers(win);
 }
 
+void BL_MakeDrawable(wmWindowManager *wm, wmWindow *win)
+{
+	wm_window_make_drawable(wm, win);
+}
+
 static void DisableForText()
 {
 	glPolygonMode(GL_FRONT_AND_BACK, GL_FILL); /* needed for texture fonts otherwise they render as wireframe */