D3D9: Add a pitch test for a 1x1 texture

[Stefan Dösinger]

> Shouldn't the test be about alignment, rather than the exact size?
> I that case the power-of-two stuff shouldn't matter either, as long as
> it's properly aligned. I do have an initial patch for native NPOT
> support, but it will (of course) only work on cards that support the
> relevant extension.
In theory yes, but there are games which depend on the exact pitch :-( 
(Warhammer 40k is one of them I think. This is what the registry key is there 
for)

I think we should switch to NP2 repacking by default(and fix it if it is 
broken), with that we can offer the correct pitch without the NPOT extension 
too.

Just as a sidenode, ddraw seems to work different. I suspect it has 64 bit 
alignment and a special case for 1x1 surfaces, I need to track that down too.
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