[Portland] Patch to xdg-su

[Jeremy White]

Say, does development for xdg-utils now shift to the xdg list?

If so, feel free to wack me with a clue bat.

But here's a patch largely inspired by Brian Harring to
tweak xdg-su a hair.

Changelog:
  *  Use $@ instead of $* to preserve parms more correctly (thanks Brian)
  *  Specifiy -c cmd and -u user as options (all the
     various tools respect those options)
  *  Tweak the usage messaging a bit
  *  Have Gnome fall back to the generic case if
     gnomesu is not installed (as I've found Gnomes
     without it; in fact, I worry that there aren't many
     with it :-/).
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