Log Message:
Update to 2.4.3

* O.k. by gdt@

Changelog:
PostGIS 2.4.3
2018/01/17

 * Bug fixes *
  - #3713, Support encodings that happen to output a '\' character
  - #3827, Set configure default to not do interrupt testing,
           was causing false negatives for many people (Regina Obe)
           revised to be standards compliant in #3988 (Greg Troxel)
  - #3930, Minimum bounding circle issues on 32-bit platforms
  - #3965, ST_ClusterKMeans used to lose some clusters on initialization
           (Darafei Praliaskouski)
  - #3956, Brin opclass object does not upgrade properly (Sandro Santilli)
  - #3982, ST_AsEncodedPolyline supports LINESTRING EMPTY and MULTIPOINT EMPTY
           (Darafei Praliaskouski)
  - #3975, ST_Transform runs query on spatial_ref_sys without schema
           qualification. Was causing restore issues. (Paul Ramsey)

 * Enhancements *
  - #3944, Update to EPSG register v9.2 (Even Rouault)