[1/4 try 3] wined3d: Activate GL context before making any GL calls in stretch_rect_fbo

[Allan Tong]

Sent to wine-devel by mistake, sorry for the noise.

Third try, this time without the incomplete FBO error in the ddraw
tests.  With this set of patches, all D3D tests should pass with FBO
offscreen rendering.

 - Allan
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