[Bug 44590] The Witness needs ATOC without multisampling

https://bugs.winehq.org/show_bug.cgi?id=44590

--- Comment #5 from Józef Kucia  ---
(In reply to Grazvydas Ignotas from comment #4)
> It would be nice to propose a GL_MESA_ extension for this, looks like most
> work would be writing the .spec file as the implementation would be trivial?
> I guess you could do it better but I could give that a try someday if you
> don't want to. This is of course only if the wine project isn't against
> using such MESA extension.

We could use such MESA extension. We already use other MESA extensions, e.g.
GLX_MESA_query_renderer.