[7/9] WineD3D: Always load glFinish and glFlush from opengl32.dll

[Stefan Dösinger]

> 2008/8/3 Stefan Dösinger <stefan at codeweavers.com>:
> > +/* glFinish and glFlush are always loaded from opengl32.dll, this
> the always have
> > + * __stdcall calling convention
> > + */
> In theory WINAPI could be something else than __stdcall.
The code uses __stdcall, not WINAPI, if USE_WIN32_OPENGL is defined, thus
I've used __stdcall here too