mesa: Generate the correct error for a depth format with a 3D texture

mesa: Generate the correct error for a depth format with a 3D texture

All versions of the OpenGL spec are quite clear that
GL_INVALID_OPERATION should be generated.  I added a quotation from the
3.3 core profile spec.

Fixes the glTexImage3D subcases of
ext_packed_depth_stencil-depth-stencil-texture and
oes_packed_depth_stencil-depth-stencil-texture_gles2.  The same subtests
of oes_packed_depth_stencil-depth-stencil-texture_gles1 fail, but they
fail with a different wrong error code.

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>