mesa: handle array textures in GenerateMipmap(), FramebufferTexture1/2D()

This was an unfinished to-do item before.
With this patch and the two preceeding patches, piglit's
fbo-generatemipmap-array test runs and passes instead of generating
a GL error and dying on an assertion.

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
1 file changed