wined3d: Add gamma linerization support for D3DFMT_A4R4G4B4

[Phil Costin]

This is a bit of an exotic format and the ARB decided not to bother with 4
bit sRGB components (with good reason) - so we support it by relying on GL 
to convert it to 8 bits per channel internally.

It most likely D3DFMT_A4R4G4B4 isn't used by newer games but its inclusion
brings the total range of texture formats we now support for sample-time
gamma linearization up to match that of native D3D.

Phil.
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