Log Message:
Update to 3.7.0:

pkgsrc changes: revise comments about geos C vs C++ library linking in
light of unexpected libtool behavior (which defeats geos's scheme)

Upstream NEWS:

3.7.0 changes
2018-09-10
- New things:
  - CAPI: GEOSDistanceIndexed (#795, Dan Baston)
  - CAPI: GEOSCoordSeq_isCCW (#870, Dan Baston)
  - CAPI: GEOSGeom_getXMin, GEOSGeom_getXMax,
          GEOSGeom_getYMin, GEOSGeom_getYMax (#871, Dan Baston)
  - CAPI: GEOSFrechetDistance (#797, Shinichi SUGIYAMA)
  - CAPI: GEOSReverse (#872, Dan Baston)
  - CAPI: GEOSGeomGetZ (#581, J Smith)

- Improvements
  - Interruptible snap operation (Paul Ramsey)
  - Numerous packaging, doc, and build changes
    (Debian group: Bas Couwenberg, Francesco Paolo Lovergine)
    (NetBSD: Greg Troxel)
  - Allow static library with C API for CMake builds (#878, Dakota Hawkins)

- C++ API changes:
  - Require defining USE_UNSTABLE_GEOS_CPP_API for use without
    warnings.
  - Make C++11 required (Mateusz Loskot)
  - Use C++11 unique_ptr, nullptr, and override constructs
    (Mateusz Loskot)
  - C++11 standard delete on noncopyable
    (#851, Vicky Vergara)
  - Fix CommonBits::getBit to correctly handle i >= 32
    (#834, Kurt Schwehr)