Update groonga to 1.2.9.

Release 1.2.9 - 2011/12/29
--------------------------

Improvements
^^^^^^^^^^^^

* Supported Fedora 16.
* Dropped Fedora 15 support.
* [groonga] Improved the default server ID address to work
  on unresolved host name environment. [Reported by @uzulla]
* Supported MAP_HUGETLB.
* [admin] Supported throughput chart.
* Stopped adding nul character in ``grn_itoh()``. [#1194]
  [Reported by SHIDARA Yoji]
* Added ``grn_obj_get_values()``.
* Added ``grn_obj_delete_by_id()``.
* Supported string vector column for query expansion. [#1216]
* Added ``--filter`` option to :doc:`/commands/delete` to delete
  many record at once. [#1225]
* Supported approximate type customization for
  :doc:`/functions/geo_in_circle` and :doc:`/functions/geo_distance`. [#1226]
* Made ``geo_distance2()`` and ``geo_distance3()`` are deprecated.
* Changed to use ``null`` instead of ``""`` for empty geo
  point value in JSON output.
* Almost supported MessagePack output. [#1215] [Worked by SHIDARA Yoji]
* Added missing newlines after drilldown result tags in XML output.
* Supported truncate for grn_dat.
* Supported longest common prefix search by grn_dat.

Fixes
^^^^^

* [windows] Fixed inverted map type.
* Fixed -Wno- compiler flag detection. [Patch by Arnaud Fontaine]
* Fixed a problem that ``groonga --version`` reports wrongly
  about MeCab. [#1209] [Patch by SHIDARA Yoji]
* Added missing lock into ``grn_obj_remove()``.
* Fixed Content-Type on error. [#1220] [Patch by SHIDARA Yoji]
* Fixed a problem that deleting SIS (Semi Infinite String)
  may keep a garbage.

(obache)