Support new Proj6 API

Closes #4322


git-svn-id: http://svn.osgeo.org/postgis/trunk@17274 b70326c6-7e19-0410-871a-916f4a2858ee
1 job for svn-trunk in 28 minutes and 48 seconds (queued for 4 seconds)
Status Job ID Name Coverage
  Test
passed #166254067
test

00:28:48