intel: Fix false positives in checking for non-packed depth/stencil RB.
intel: Fix false positives in checking for non-packed depth/stencil RB.

The wine d3d9 visual.c testcase was tripping over this and failing.
Presumably it's binding a packed depth/stencil texture to both
stencil and depth attachment points, and we make a new renderbuffer
wrapper for each in that case.

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