[XeTeX] modified changebar.sty

[maxwell]

Some years ago, Apostolos Syropoulos modified the changebar.sty file 
that comes with the TeXLive distro so that it would work with xelatex, 
by adding
    \DeclareOption{xetex}{\cb at xetexcheck}
etc.

This code seems to be working, but it never got into the TeXLive distro. 
  Should(n't) it?

    Mike Maxwell