cg-diff still broken on some BSDs

Petr,

We still have a bug in cg-diff when using the BSD xargs. I posted a
fix, and Junio posted an alternative approach. The original patches
are here http://marc.theaimsgroup.com/?l=git&m=112541165904627&w=2

For some strange reason, it is not showing up on my OSX box, but it is
definitely reproduceable in a proper FreeBSD box.

I am happy to rebase my patch (or Junio's) against current cogito if
needed, but I rather do only one of them ;)

cheers,


martin