Revert "opengl32: Return a NULL pointer for functions requiring unsupported or disabled extensions.".

[Henri Verbeet]

On 26 November 2015 at 08:08, Henri Verbeet <hverbeet at gmail.com> wrote:
> This is wrong. I we really want to add hacks for specific combinations
> of broken drivers and applications,
And for the record, I'm not convinced we do. I think it's more
productive to make sure things work with the free drivers than going
out of our way to support proprietary drivers.