6582 initial reorg adding sys/null.h for 5218
6487 clean up __STDC__ ifdefs in rpcsvc/dbm.h
6563 fmtmsg.h should be simplified and neither define NULL nor _NULL
Reviewed by: Josef 'Jeff' Sipek <jeffp

6582 initial reorg adding sys/null.h for 5218
6487 clean up __STDC__ ifdefs in rpcsvc/dbm.h
6563 fmtmsg.h should be simplified and neither define NULL nor _NULL
Reviewed by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
Reviewed by: Gary Mills <gary_mills@fastmail.fm>
Reviewed by: Robert Mustacci <rm@joyent.com>
Approved by: Dan McDonald <danmcd@omniti.com>

refs #4100

(cherry picked from commit fb8304fb7c4a841b5eed7123c8e47ee4ff9bea68)

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