This makes cleanup after errors much easier, as we can just use the regular
destructor.

The parameter controls whether weak references are ignored, not
whether the last stub_manager_int_release should be called when the
total reference count goes to zero.

opengl32: Fix wglCreateContextAttribsARB test on vista/win7 where Nvidia drivers return hresults instead of win32 errors.

The two formats do not match exactly.