Update ChangeLog

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+2012-07-21  Ivan Maidanski <ivmai@mail.ru>
+
+       * os_dep.c (GC_get_stack_base): Abort if pthread_stackseg_np fails
+       (if GC_OPENBSD_THREADS).
+       * pthread_stop_world.c (GC_suspend_all): Get correct stack_ptr by
+       calling pthread_stackseg_np (subtracting ss_size from ss_sp) instead
+       of retrieving it from OpenBSD pthread implementation-dependent context
+       (if GC_OPENBSD_THREADS); remove comment.
+
 2012-06-17  Ivan Maidanski <ivmai@mail.ru>
 
        * tests/initsecondarythread.c: Include "private/config.h" if