Update to postgis 2.4.0, gdal 2.2.2, and supporting deps#487

Merged

springmeyer merged 4 commits intomasterfrom postgis-updates

Oct 24, 2017

+1,270

Commits on Oct 18, 2017

new package versions
Dane Springmeyer
committed
fix expat extract [skip ci]
Dane Springmeyer
committed
fix working dir for package precompile [skip ci]
Dane Springmeyer
committed

Commits on Oct 23, 2017

explicitly disable sfcgal to avoid building against homebrew version
Dane Springmeyer
committed