GDAL3 with cURL and GEOS support

v3.0.2-1

Enable libtool again.as it seems to produce huge binaries and kill ma…

v3.0.2

Force gcc7 versions as gcc4 doesn't work. Disable libtool.

v3.0.0-3

Fix cxx string abi issues by building with GCC 7 on Windows.

v3.0.0-2

Windows fixes, build shared library and strip dll

v3.0.0-1

disable libtool again on windows

Switch to GDAL 2.4.1, and add curl and sqlite3 dependencies.

make libtool usage dependent on target

And be explicit about --without-python

Error in windows:
```/workspace/destdir/x86_64-w64-mingw32/lib/../lib/libstdc++.la: No such file or directory```
It comes from this Travis job: https://travis-ci.org/JuliaGeo/GDALBuilder/jobs/515658089#L639

Error --without-libtool on Linux:
However that breaks the `i686-linux-gnu` and `x86_64-linux-gnu` builds with `undefined reference to `__dso_handle'`: https://travis-ci.org/JuliaGeo/GDALBuilder/jobs/518166189#L638-L640
(which might be a compiler bug)

v2.3.2-0

Switch to GDAL 2.3.2, and add curl and sqlite3 dependencies.

v2.2.4-1

Run with the latest BinaryBuilder to see if RPATH issues for Unix are fixed.

v2.2.4-0

First build. Fairly minimal, but with GEOS and PROJ support.