Cats X support now in tree.

Hi,

I've great pleasure in saying that the patches to xsrc to support cats have
now been submitted, and will be available from a mirror near you soon 8)

I'll be building sets for xsrc on -current in the next couple of days, I'll
also do some against 1.6BETA at some point this week.

Note that I'm not sure if there's a knock on effect for pkgs, as I think
that currently the arm ones are built against X 3.3.6.

If necessary I'll start my cats doing pkgs.

Chris