wined3d: Fix compile for older OpenGL headers.

H. Verbeet hverbeet at
Tue Feb 28 10:16:11 CST 2006

Although #ifdef GL_VERSION_2_0 will make compilation work with older
OpenGl headers, it's not the way to fix this. Basically, wined3d
should check for functionallity during runtime with GL_SUPPORT and
call extensions with GL_EXTCALL. The issue has come up a few times
before with patches from the same author, and I think he should be
aware of the issue by now.

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