NTP is now release candidate with 4.2.7p484.

Upline now uses devel branch for release candidates,
thus remove net/ntp-rc.
Update distinfo.
Upgrade from 2.8.17 to 2.8.18.

<ChangeLog>

--[ Redis 2.8.18 ] Release date: 4 Dec 2014

# UPGRADE URGENCY: LOW for both Redis and Sentinel. This release mostly
                   adds new features to Redis, and contains non critical
                   fixes.

* [FIX] Linenoise updated to be more VT100 compatible. (Salvatore Sanfilippo)
* [FIX] A number of typos fixed inside comments. (Various authors)
* [FIX] redis-cli no longer quits after long timeouts. (Matt Stancliff)
* [FIX] Test framework improved to detect never terminating scripts, cleanup
        instances on crashes. (Salvatore Sanfilippo)
* [FIX] PFCOUNT can be used on slaves now. (Salvatore Sanfilippo)
* [FIX] ZSCAN no longer report very small scores as 0. (Matt Stancliff,
        Michael Grunder, Salvatore Sanfilippo)
* [FIX] Don't show the ASCII logo if syslog is enabled. Redis is now
        an Enterprise Grade product. (Salvatore Sanfilippo)

* [NEW] EXPERIMENTAL: Diskless replication, for more info check the doc at
        http://redis.io/topics/replication. (Salvatore Sanfilippo).
* [NEW] Transparent Huge Pages detection and reporting in logs and
        LATENCY DOCTOR output. (Salvatore Sanfilippo)
* [NEW] Many Lua scripting enhancements: Bitops API, cjson upgrade and tests,
        cmsgpack upgrade. (Matt Stancliff)
* [NEW] Total and instantaneous Network bandwidth tracking in INFO.
* [NEW] DEBUG POPULATE two args form implemented (old form still works).
        The second argument is the key prefix. Default is "key:" (Salvatore
        Sanfilippo)
* [NEW] Check that tcp-backlog is matched by /proc/sys/net/core/somaxconn, and
        warn about it if not. (Salvatore Sanfilippo)

</ChangeLog>
Build devel/libpru only on FreeBSD 10+.

Differential Revision:	https://reviews.freebsd.org/D1298
Reviewed by:	swills
Approved by:	swills
Assume maintainership.
Cleanup the xerces-c* mess

xerces-c2 and xerces-c3 were not playing nicely together most of the applications
and are incompatible, all application has been switch to the c3 version
Hook to the build