xorg-server-1.4.2 and thinkpad T60p

[David Brownlee <abs%absd.org@localhost>]

        Many thanks to Blair for taking pkgsrc/wip/modular-xorg-server
        to 1.4.2 - my T60p (M56GL [Mobility FireGL V5250] radeonhd driver)
        used to have all sorts of strangeness in firefox with the previous
        version - any resized image would show up mostly black, and
        sometimes a white background on a page would show copies of
        random other windows :)