[Intel-gfx] [RFC] reduce number of visuals exposed by Intel drivers

[Ian Romanick]

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I'd like to remove a bunch of the visuals and fbconfigs exposed by the
Intel drivers.  There are several categories of visuals that are likely
not useful to anyone.  A couple of our test suites (e.g., glean) like to
run over every possible visual.  As a result, the test suites take an
extraordinary amount of time to run.

I propose removing:

  * All 24-bit depth / 0-bit stencil visuals.  These are compatible with
the default state of a 24-bit depth / 8-bit stencil visual and offer no
memory savings.  This will eliminate 24 (of 72) visuals by itself.

  * All but one of the visuals with accumulation buffer.  Accumulation
is a software path in the Intel drivers (though this could be fixed), so
I don't see any utility in offering multiple, optimized buffer
configuration choices.  This will eliminate an additional 23 visuals.

This will leave the 25 visuals and 37 fbconfigs that are likely to be
useful.

Anyone have a concerns with me doing this?
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