MakeTexture565 bug?

[fcorbier]

It looks like the asm MakeTexture565 function in texconv.c doesn't use the width parameter and always assume a texture with a width of 512.

I think what would need to be fixed are those hardcoded offsets in the function (1024, 2048, 3072). I'd try to fix it myself but the only asm code I know is i386 =(