Implement a fine-grain control system which allows header developers to control the exposure of macros and prototypes depending upon the POSIX, X/Open, or ISO C version an application has requested.
Implement a fine-grain control system which allows header developers
to control the exposure of macros and prototypes depending upon the
POSIX, X/Open, or ISO C version an application has requested.

Submitted by:	wollman
Reviewed by:	bde, imp

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