rt/tst-clock_nanosleep2 failure

[DJ Delorie]

I recall thinking "this could never happen" but I'm paranoid so at least
I checked for it anyway.  I like your test better, because it doesn't
*fail* the unexpected case.  We could argue about whether/how to support
this case, but I think we should apply this first ;-)

However, do we need to do something special to get the test to show up
as UNSUPPORTED instead of PASS?  Or some magic to choose between PASS
(mostly) or UNSUPPORTED (mostly) ?