[PATCH] unlocked stdio extensions

[Yaakov Selkowitz]

This is a first draft of an implementation of the 19 unlocked stdio 
extensions:

http://man7.org/linux/man-pages/man3/unlocked_stdio.3.html

These are used most notably by GCC when available.

There are a few points that could use clarification:

* are there any CHECK_INITs that are missing or unnecessary in these 
functions?

* should the documentation of the _unlocked variants be separate, or 
merged with the locking variants (as the _r variants do)?

-- 
Yaakov Selkowitz
Associate Software Engineer, ARM
Red Hat, Inc.
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