Commit 0f163d1d

 removed the non-default window size from many tests.
However, quite a few of these tests had power-of-two window sizes for
drivers that do not support GL_ARB_texture_non_power_of_two.

Fixes

    fbo-nodepth-test on NV20 and i865G
    fbo-nostencil-test on NV20 and i865G
    fbo-alphatest-formats on i865G
    fbo-blending-formats on NV20 and i865G

Somehow fbo-alphatest-formats was previously passing on NV20.

There are still a few failures in fbo-blending-formats on i865G, but the
test mostly passes.  The remaining failures there are likely legitimate
problems.

None of the tests were fixed on R200, and both fbo-alphatest-formats and
fbo-blending-formats go from FAIL to CRASH.  Both hit an assertion:

main/format_utils.c:178: _mesa_compute_rgba2base2rgba_component_mapping: Assertion `!&"Unexpected base format"' failed.

This should also fix these tests on NV10, NV30, and r100.  I suspect
r100 will have the same troubles as r200.

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Brian Paul <brianp@vmware.com>
Cc: Ilia Mirkin <imirkin@alum.mit.edu>