Install ntp html docs as /usr/share/doc/ntp

svn path=/head/; revision=55740

usr.sbin/ntp/doc/Makefile

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+# $FreeBSD$
+
+DOCSDIR=	/usr/share/doc/ntp
+
+HTMLS=	accopt.htm assoc.htm authopt.htm biblio.htm build.htm clockopt.htm \
+	config.htm confopt.htm copyright.htm debug.htm driver1.htm \
+	driver10.htm driver11.htm driver12.htm driver16.htm driver18.htm \
+	driver19.htm driver2.htm driver20.htm driver22.htm driver23.htm \
+	driver24.htm driver26.htm driver27.htm driver28.htm driver29.htm \
+	driver3.htm driver30.htm driver32.htm driver33.htm driver34.htm \
+	driver4.htm driver5.htm driver6.htm driver7.htm driver8.htm \
+	driver9.htm exec.htm extern.htm gadget.htm hints.htm \
+	howto.htm htmlprimer.htm index.htm kern.htm kernpps.htm \
+	ldisc.htm measure.htm miscopt.htm monopt.htm mx4200data.htm \
+	notes.htm ntpd.htm ntpdate.htm ntpdc.htm ntpq.htm ntptime.htm \
+	ntptrace.htm parsedata.htm parsenew.htm patches.htm porting.htm \
+	pps.htm prefer.htm quick.htm rdebug.htm refclock.htm release.htm \
+	tickadj.htm vxworks.htm y2k.htm
+
+beforeinstall:
+.for file in ${HTMLS}
+	cd ${.CURDIR}/../../../contrib/ntp/html ; \
+	${INSTALL} -c -o ${BINOWN} -g ${BINGRP} -m 444 ${file} \
+		${DESTDIR}${DOCSDIR}
+.endfor
+
+.include <bsd.prog.mk>