to XFAIL or not to XFAIL

[DJ Delorie]

> We have UNSUPPORTED and UNTESTED for `impossible to fix on this
> target' and `impossible to test on this target' respectively.

The dejagnu documentation disagrees.  It lists UNSUPPORTED as
impossible (or meaningless) to test on this target.  UNTESTED is given
by a placeholder for a missing or incomplete test.

However, the docs agree that XFAIL means "bug, but expected", and
indicate that these would signal XPASS's when the bug is finally
fixed.

Summary: http://www.delorie.com/gnu/docs/dejagnu/dejagnu_9.html