K 10
svn:author
V 6
tsoome
K 8
svn:date
V 27
2018-07-14T09:29:45.682757Z
K 7
svn:log
V 211
regex/engine.c: error: variable 'dp' set but not used

The issue found with gcc6 build (originally on illumos, confirmed on FreeBSD).
Mark it __unused.

Differential Revision:	https://reviews.freebsd.org/D13109

END