Add global stdio streams support for reent small.

Douglas info@ourairquality.org
Wed Feb 28 12:58:00 GMT 2018


The global stdio streams option did not appear to work with reent small
option, but these two options are both useful on a low memory system.

This seems to simplify the reent small code in this area when using the
global stdio streams option. The fake streams and some of the checking
is not longer necessary.

btw the __sf slot in the reent small struct _reent appears to be unused.
Could that be removed, or is it fill for backwards compatibility?
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