gcc/gthr-posix.h changes

[Jeffrey A Law]

  In message < 200008102206.PAA31015@orion.nsr.hp.com >you write:
   > You're right. What is then the correct file to be included, is there an
  > auto-target.h file created?
Well, for libgcc, you're in a world of pain since we don't have autoconf
capabilities for the target at that point during a compile.

However, if you could somehow defer including that stuff to something in
libobjc, then you can use autoconf to test for it.

jeff