Other ISO C TR / TS / standard optional APIs

[Roland McGrath]

> * C11 Annex K (bounds-checking interfaces).  I don't think there were 
> particularly strong objections to supporting these, possibly in a separate 
> libc_s.so, but no great liking for them either (and the discussion of a 
> patch submission a while back died down without revised resubmission).

Definite no for including in libc.so directly.
Probable no for implementing them at all, based on previous discussion.