WGL: wglDeleteContext should fail on garbage handles

[Roderick Colenbrander]

Hi,

When the context being passed to wglDeleteContext is NULL or 'garbage' we should return FALSE and set the error to invalid handle. Inside gdi32 we don't have knowledge whether a garbage handle is valid (it has a list in which it maintains valid contexts). Luckily opengl32 has, so pass the handle to the display driver using a default context.

Regards,
Roderick Colenbrander
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