backport: re PR boehm-gc/34544 (pthread_default_stacksize_np failed.)

backport: re PR boehm-gc/34544 (pthread_default_stacksize_np failed.)

	Backport from mainline:
	2010-08-22  John David Anglin  <dave.anglin@nrc-cnrc.gc.ca>

	PR boehm-gc/34544
	* gthr-posix.h (__gthread_active_init): Delete.
	(__gthread_active_p): Do activity check here.
	Don't include errno.h on hppa-hpux.  Update comment.
	* gthr-posix95.h (__gthread_active_init): Delete.
	(__gthread_active_p): Do activity check here.
	Don't include errno.h on hppa-hpux.  Update comment.

From-SVN: r170527