Upgrade from 2.8.14 to 2.8.15.

<ChangeLog>

--[ Redis 2.8.15 ] Release date: 12 Sep 2014

# UPGRADE URGENCY: LOW for Redis, HIGH for Sentinel.

* [FIX] Sentinel critical bug fixed: the absolute majority was computed in a
        wrong way because of a programming error. Now the implementation does
        what the specification says and the majority to authorize a failover
        (that should not be confused with the ODOWN quorum) is the majority of
        *all* the Sentinels ever seen for a given master, regardless of their
        current state.
* [FIX] GETRANGE test no longer fails for 32 bit builds (Matt Stancliff).
* [FIX] Limit SCAN latency when the hash table is in an odd state (very few
        populted buckets because rehashing is in progress). (Xiaost and
        Salvatore Sanfilippo)

* [NEW] Redis is now able to load truncated AOF files without requiring a
        redis-check-aof utility run. The default now is to load truncated
        (but apparently not corrupted) AOFs, you can change this in redis.conf.
        (Salvatore Sanfilippo).
* [NEW] Sentinel: ability to announce itself with an arbitrary IP/port to work
        in the context of natted networks. However this is probably still
        not enough since there is no equivalent mechanism for slaves listed
        in the master INFO output. (Dara Kong and Salvatore Sanfilippo)

</ChangeLog>
Allow to build without having linprocfs(5) mounted.
- Use flex and bison from ports
- Bump PORTREVISION

PR:		193654
Submitted by:	ohartman@zedat.fu-berlin.de
x11-wm/afterstep-stable: Use execinfo test instead of OSVERSION check

STATIC_LIBEXECINFO value has to track the inclusion of devel/libexecinfo
so use the same test as USES+=execinfo uses and avoid using the
discouraged (and wrong for DragonFly) OSVERSION check.  This is really
a follow-up to a previous commit that added USES+=execinfo.
Bump dependent ports' revisions following devel/tbb update (r368296)

Submitted by:	jhale
x11-fonts/sgifonts: Use $TAR instead of $EXTRACT_CMD

Currently, FreeBSD defines EXTRACT_CMD as $TAR, but DragonFly does not
have a default value for EXTRACT_CMD.  Using $TAR instead of $EXTRACT_CMD
is a No-Op for FreeBSD, but restores the build on DragonFly which got
disrupted as a result of the previous commit.
Update to 2.20.
- Fix build break if PULSEAUDIO is defined but not ALSA or LIBV4L

PR:		193657
Submitted by:	farid@hajji.name
Remove www/squid32 and 4 ports dependent on www/squid (v2.7)

The www/squid port, which is also expired, will be upgraded to Squid
version 3.4 rather than removing it.