New contributor o/ hello, and small diff.

[Yaakov Selkowitz]

On 2017-06-26 14:53, Dionna Amalie Glaze via newlib wrote:
> The formatted patch is attached.

This patch is incorrect.  __USE_* are glibc internals; we use the 
__*_VISIBLE internal macros as defined and documented in sys/features.h.

-- 
Yaakov