Update to 2.2.2.

PostGIS 2.2.2
2016/03/22

* Bug Fixes *

  - #3463, Fix crash on face-collapsing edge change
  - #3422, Improve ST_Split robustness on standard precision double
          systems (arm64, ppc64el, s390c, powerpc, ...)
  - #3427, Update spatial_ref_sys to EPSG version 8.8
  - #3433, ST_ClusterIntersecting incorrect for MultiPoints
  - #3435, ST_AsX3D fix rendering of concave geometries
  - #3436, memory handling mistake in ptarray_clone_deep
  - #3437, ST_ClusterIntersecting incorrect for MultiPoints
  - #3461, ST_GeomFromKML crashes Postgres when there are
          innerBoundaryIs and no outerBoundaryIs
  - #3429, upgrading to 2.3 or from 2.1 can cause loop/hang on some
          platforms
  - #3460, ST_ClusterWithin 'Tolerance not defined' error after upgrade
  - #3490, Raster data restore issues, materialized views
    Scripts postgis_proc_set_search_path.sql, rtpostgis_proc_set_search_path.sql
    refere to http://postgis.net/docs/manual-2.2/RT_FAQ.html#faq_raster_data_not_restore
  - #3426, failing POINT EMPTY tests on fun architectures

(gdt)