[d3d9] shademode_test: increase slop in color comparison

[Stefan Dösinger]

Am Montag, 12. Mai 2008 22:54:18 schrieb Dan Kegel:
> The test allowed for a slop of (-1,0) in the colors,
> but on my machine,
> nVidia Corporation NV17 [GeForce4 440 Go 64M]
> the colors were off by +1.  So change the code
> to allow for a slop of +-1, and switch to a more readable
> way of comparing colors.
Henri once said he had a universal patch for color slop he was going to send, 
I'm not sure what happened to it