[PATCH] libio fixes for glibc 2.1.90

[Ulrich Drepper]

I've checked in a modified version of the patch:

- the result of _IO_CHECK_WIDE is reversed.  It returns zero if no wide
  char data is available.  Seems more logical

- none of the wide character functions is modified

- I don't see why you want this:

> 	Call _IO_WSETBUF even for _mode 1.

  It's also left out.  If you think it is needed provide a rational.

With these patches applied groff is running just fine.

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