Reviewed by eseidel.  Landed by eseidel.

        Offer a way for BuildBot to not colorize the cmake output, when building
        with the 'build-webkit' script. Add "--color" / "--no-color" option pair.

        Default is colorize output, though only Qt platform handles this for now.

        * Scripts/build-dumprendertree:
        * Scripts/build-webkit:
        * Scripts/webkitdirs.pm:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@16736 268f45cc-cd09-0410-ab3c-d52691b4dbfc