Revision 517868

MFH: r515926 r517694

patch-ntpd_ntp.c should really be named patch-ntpd_ntpd.c as it patches
ntpd/ntpd.c.

Disable ntpd stack gap. When ASLR with STACK GAP != 0 ntpd suffers SIGSEGV.

PR:		241421, 241960
Reported by:	Vladimir Zakharov <zakharov.vv@gmail.com>,
		dewayne@heuristicsystems.com.au
Reviewed by:	kib, imp (previous version), ian (suggestion)
Differential Revision:  https://reviews.freebsd.org/D22358

Approved by:	portmgr (joneum)