vcpkg/ports/libspatialindex, branch 2019.08

vcpkg/ports/libspatialindex, branch 2019.08 Forked from https://github.com/microsoft/vcpkg [libspatialindex]Add new port (#7762) 2019-08-20T15:41:32+00:00 Long Huan 8551701+longhuan2018@users.noreply.github.com 2019-08-20T15:41:32+00:00 3173e5516a6f495404c17311bedb8927369f2959 * new port libspatialindex * Update portfile.cmake * support static build

* new port libspatialindex

* Update portfile.cmake

* support static build