Update to snort-2.1.2. From Adrian Portelli in PR pkg/25029.

While here, convert to buildlink3.

Changes:
* Various portability fixes.
* Fixed conversation parsing faults so users can operate this
  preprocessor
* Detect non-rfc standard chunk encodings.  Detect abnormal HTTP
  requests with newlines, spaces, etc. before the request method.
* Fix negative stats output on snort exit or SIGUSR1.
* Removed escaping of '%' and '_' characters in MySQL
* Various documentation fixes/updates.
* Added Flowbits detection functionality.
* Added utility to parse out perfmon stats.
* Tagged Packets no longer have NULL msg name.
* Fixed http_inspect double alerting on pkts and rebuilt streams.
* http_inspect proxy_alert now supports normal proxy networks setups.
  http_inspect default server only valid if specified in config.
* Close Socket when Snort receives SIGHUP.
* Added GID, SID, and Rev to csv output.
* config chroot readded.
* Added additional error checking for custom rules.
* Flow now honors -q (quiet).
* Removed non_rfc_chars from default profiles.
* Added suppression negation.
* Better support for ODBC.  Better memory management. Improved escaping
  of SQL strings.
* Other miscellaneous bugfixes.

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