ucontext broken for s/390

[Ulrich Drepper]

"Martin Schwidefsky" <schwidefsky@de.ibm.com> writes:

> Uli (Weigand) and me had a session on how to fix this. The conclusion
> was that since it was completly broken anyway we can as well redefine
> both structures and make them look sane.

I've applied the patch now (after 2.2.4).  Thanks,

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