opengl32: add a test for WGL_EXT_swap_control [try 2]

[Ken Thomases]

On Apr 29, 2013, at 10:42 AM, Roderick Colenbrander wrote:

> Updated version of the patch which marks the failing test as todo_wine. The
> final goal is to make the swap interval in the winex11 driver not global
> anymore (and store it with the drawable) and add some new functionality.
> <0001-opengl32-add-a-test-for-WGL_EXT_swap_control.patch>

For what it's worth, the Mac driver does it (apparently) wrong but in the other way.  In the Mac driver, the swap interval is currently part of the context state, so not part of the drawable.  But it's definitely not global.

-Ken