[Portland] Patch to xdg-su

[Jeremy White]

> I think the scripts should take full care of command line parsing and
> the return values. So it shouldn't pass command line options to the
> native method (e.g. kdesu or gnomesu in this case) if those command line
> options aren't documented as such in the documentation of the xdg-*
> script. Like wise, the script should generate its own return values and
> define what all return values mean.

Yes, I agree strongly.

> 
> Btw, Without xsu it should be possible to do something like
> 	xterm -geom 60x5 -e su -c $*

Yah.  I went and looked at our implementation of su,
and we actually probe for a terminal emulator
(believe it or not, xterm is not shipped on all distros!)
We also use sudo in preference to su, if it's in the path.

Cheers,

Jeremy