Update to 2.3.1

Drop build patch incorporated upstream.

Upstream changes:

PostGIS 2.3.1 (2016/11/28)

* Bug fixes

PostGIS 2.3.0 (2016/09/26)

* Important / Breaking Changes

  - #3466, Casting from box3d to geometry now returns a 3D
           geometry (Julien Rouhaud of Dalibo)

  - #3604, pgcommon/Makefile.in orders CFLAGS incorrectly leading to
           wrong liblwgeom.h (Greg Troxel)

  - #3396, ST_EstimatedExtent, throw WARNING instead of ERROR
           (Regina Obe)

* New Features

  - Add support for custom TOC in postgis_restore.pl
    (Christoph Moench-Tegeder)
  - Add support for negative indexing in ST_PointN and ST_SetPoint
    (Rémi Cura)
  - Add parameters for geography ST_Buffer (Thomas Bonfort)
  - TopoGeom_addElement, TopoGeom_remElement (Sandro Santilli)
  - populate_topology_layer (Sandro Santilli)
  - #454,  ST_WrapX and lwgeom_wrapx (Sandro Santilli)
  - #1758, ST_Normalize (Sandro Santilli)
  - #2236, shp2pgsql -d now emits "DROP TABLE IF EXISTS"
  - #2259, ST_VoronoiPolygons and ST_VoronoiLines (Dan Baston)
  - #2841 and #2996, ST_MinimumBoundingRadius and new ST_MinimumBoundingCircle
           implementation using Welzl's algorithm (Dan Baston)
  - #2991, Enable ST_Transform to use PROJ.4 text (Mike Toews)
  - #3059, Allow passing per-dimension parameters in ST_Expand (Dan Baston)
  - #3339, ST_GeneratePoints (Paul Ramsey)
  - #3362, ST_ClusterDBSCAN (Dan Baston)
  - #3364, ST_GeometricMedian (Dan Baston)
  - #3391, Add table inheritance support in ST_EstimatedExtent
           (Alessandro Pasotti)
  - #3424, ST_MinimumClearance (Dan Baston)
  - #3428, ST_Points (Dan Baston)
  - #3465, ST_ClusterKMeans (Paul Ramsey)
  - #3469, ST_MakeLine with MULTIPOINTs (Paul Norman)
  - #3549, Support PgSQL 9.6 parallel query mode, as far as possible
           (Paul Ramsey, Regina Obe)
  - #3557, Geometry function costs based on query stats (Paul Norman)
  - #3591, Add support for BRIN indexes. PostgreSQL 9.4+ required.
           (Giuseppe Broccolo of 2nd Quadrant, Julien Rouhaud
            and Ronan Dunklau of Dalibo)
  - #3496, Make postgis non-relocateable for extension install,
           schema qualify calls in functions (Regina Obe)
           Should resolve once and for all for extensions #3494, #3486, #3076
  - #3547, Update tiger geocoder to support TIGER 2016
           and to support both http and ftp.
  - #3613, Segmentize geography using equal length segments
           (Hugo Mercier of Oslandia)

* Bug Fixes

* Performance Enhancements

  - #75, Enhancement to PIP short circuit (Dan Baston)
  - #3383, Avoid deserializing small geometries during index operations
           (Dan Baston)
  - #3400, Minor optimization of PIP routines (Dan Baston)
  - Make adding a line to topology interruptible (Sandro Santilli)

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