libio fix

[Ulrich Drepper]

I've checked in (among other things) a patch which should help solving
many of the reported libio incompatibility problems.  The reason often
was that a stream was opened with an old fopen() and close with a new
fclose() or vice versa.  This should work now.

Andreas, this should also help for this one PR with this Apache/PHP
problem.

Let me know if you see progress or regressions.

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