[Mesa-dev] gallium & texture rectangles

[Luca Barbieri]

Pushed a new version that had no piglit regressions on nv30, softpipe
and "softpipe without NPOT".

Vega, Xorg, EGL and WGL still require PIPE_CAP_NPOT_TEXTURES to work
properly, but this can be fixed later if desired.

It should hopefully have a decent chance of being correct or nearly so
at least if PIPE_CAP_NPOT_TEXTURES is supported, or if only OpenGL
with DRI is used in case it isn't supported.