Update to NSPR 4.9.5 Beta 2, part 2: actual changes.

mozilla/nsprpub/pr/include/md/_pth.h

 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #ifndef nspr_pth_defs_h_
 #define nspr_pth_defs_h_
 
 /*
 ** Appropriate definitions of entry points not used in a pthreads world
@@ skipping 100 matching lines @@
         memset(&(t), 0, sizeof(pthread_t))
 #define _PT_PTHREAD_THR_HANDLE_IS_INVALID(t) \
         (!memcmp(&(t), &pt_zero_tid, sizeof(pthread_t)))
 #define _PT_PTHREAD_COPY_THR_HANDLE(st, dt)   (dt) = (st)
 #elif defined(IRIX) || defined(OSF1) || defined(AIX) || defined(SOLARIS) \
         || defined(LINUX) || defined(__GNU__) || defined(__GLIBC__) \
         || defined(HPUX) || defined(FREEBSD) \
         || defined(NETBSD) || defined(OPENBSD) || defined(BSDI) \
         || defined(NTO) || defined(DARWIN) \
         || defined(UNIXWARE) || defined(RISCOS) || defined(SYMBIAN)
-#ifdef __GNU__
-/* Hurd pthreads don't have an invalid value for pthread_t. -- rmh */
-#error Using Hurd pthreads
-#endif
 #define _PT_PTHREAD_INVALIDATE_THR_HANDLE(t)  (t) = 0
 #define _PT_PTHREAD_THR_HANDLE_IS_INVALID(t)  (t) == 0
 #define _PT_PTHREAD_COPY_THR_HANDLE(st, dt)   (dt) = (st)
 #else 
 #error "pthreads is not supported for this architecture"
 #endif
 
 #if defined(_PR_DCETHREADS)
 #define _PT_PTHREAD_ATTR_INIT            pthread_attr_create
 #define _PT_PTHREAD_ATTR_DESTROY         pthread_attr_delete
@@ skipping 130 matching lines @@
         || defined(LINUX) || defined(__GNU__) || defined(__GLIBC__) \
         || defined(FREEBSD) || defined(NETBSD) || defined(OPENBSD) \
         || defined(BSDI) || defined(NTO) || defined(DARWIN) \
         || defined(UNIXWARE) || defined(RISCOS) || defined(SYMBIAN)
 #define _PT_PTHREAD_YIELD()             sched_yield()
 #else
 #error "Need to define _PT_PTHREAD_YIELD for this platform"
 #endif
 
 #endif /* nspr_pth_defs_h_ */