[iOS build warnings] Mark params __unused or #pragma unused #11797
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Motivation: reduce build noise that might worry new users or hide real problems.
This deals with four of the warnings currently in the iOS build. The
__unused
additions are standard and self-explanatory, following the style used elsewhere in RN. I've used#pragma unused
to deal with parameters named by macros.Tested by building and running the
UIExplorer
example app in XCode 8.2