libio patches for glibc 2.1

[Ulrich Drepper]

Joe Buck <jbuck@Synopsys.COM> writes:

> Ah, so the disruption is just for extended and wide streams?  Then it
> seems that it should be a one-time thing.

Not if I missed something.  Wide streams are still not supported since
I've yet to decide how to implement this correctly.  But I've added
some unused padding bytes at the end of the struct so that we can add
new members later.

-- Uli
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