no prototype for realpath()

[Joel Sherrill]

Hi

I noticed realpath() does not have a prototype.

It looks like it should be in stdlib.h and wrapped
by this per Linux:
  _BSD_SOURCE || _XOPEN_SOURCE >= 500 ||
  _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED

(1) Is it OK to add to newlib's stdlib.h?
(2) What guards should I use?

Thanks.

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