[Bug target/81266] FAIL: 30_threads/thread/native_handle/typesizes.cc execution test on darwin

[iains at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81266

Iain Sandoe <iains at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2018-12-03
     Ever confirmed|0                           |1

--- Comment #2 from Iain Sandoe <iains at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #1)
> This was previously only run for GNU/Linux, Solaris and AIX, but is now
> enabled for all pthreads targets. I don't think this particular test will
> ever pass for targets where is_pointer<pthread_t> is true.

So - just skip this on Darwin, or invent some new target supports test for
pthread-non-pointer? (not entirely sure that would be unequivocally trivial)