arm patch for linuxthreads; vfork etc

[Ulrich Drepper]

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Philip Blundell wrote:
> This fixes a couple of bugs related to system call cancellation, and
> adds the appropriate handling for vfork.

I've added this patch.  But I had to apply it by hand due to linebreaks.
 Please make sure everything is correct.  Thanks,

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Ulrich Drepper \    ,-----------------'   \ Mountain View, CA 94041 USA
Red Hat         `--' drepper at redhat.com `---------------------------
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