[PATCH] Fix OpenBSD/amd64 sigtramp detection

[Joel Brobecker]

> Joel, is this ok for the branch too?

Sure.  And for the future, if you are confident about a change, and
that changes only affects a selected list of targets, you have
the authority to decide whether it goes in or not.

> 2011-12-17  Mark Kettenis  <kettenis@gnu.org>
> 
> 	* amd64obsd-tdep.c (amd64obsd_sigtramp_p): Detect new signal
> 	trampoline to be introduced in OpenBSD 5.0.
-- 
Joel