Added SDL_CreateWindowWithPosition()

It turns out there's a race condition on X11 where the window could be placed by the window manager while being placed by the application, so we need to have the initial position available at window creation.

src/dynapi/SDL_dynapi.sym

@@ -841,6 +841,7 @@ SDL3_0.0.0 {
     SDL_GetSystemTheme;
     SDL_CreatePopupWindow;
     SDL_GetWindowParent;
+    SDL_CreateWindowWithPosition;
     # extra symbols go here (don't modify this line)
   local: *;
 };