* testsuite/thread/pthread5.cc: Include <unistd.h>

if _GLIBCPP_HAVE_UNISTD_H is defined.
(main): Only use pthread_attr_setscope if
_POSIX_THREAD_PRIORITY_SCHEDULING is defined.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@58608 138bc75d-0d04-0410-961f-82ee72b054a4