v2: * Deduplicate passed attributes keeping the last specified value. * Always sort results preferring better acceleration, fewer accum buffer bits, and 32bpp color bits. * Fail if the attribute list contains an attribute we don't know about (matches AMD and Intel, NVIDIA succeeds with 0 results, see https://testbot.winehq.org/JobDetails.pl?Key=146647). I am not yet setting an error value, although Intel returns our old friend 0xC007000D and AMD nothing as usual.