more stdio functions

[Ulrich Drepper]

You might have seen that I added a bunch of new stdio functions.
These come from Solaris where they are provided to avoid the
unportable poking in the FILE structure.  Some GNU programs already
use these functions.

One of the functions is doing something which wasn't possible before.
The __fsetlocking function allows to set the stream in a mode where
the functions are not performing any locking operations.  This might
be useful for lazy programmers who don't want to use the _unlocked
functions but also for the case where no unlocked equivalents are
available (e.g., printf).

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