WIP: Add gdal 3.2.1

[Erotemic]

I need to be able to build gdal 3.2.1 without sudo. I tried to do it standalone, but it is dependency hell. It would be nice if fletch could support this. Hopefully this won't be too difficult to add support for.

[kwcvrobot]

Fletch KWIVER against Fletch Centos build succeeded.

[kwcvrobot]

Fletch KWIVER against Fletch LinuxGPU build succeeded.

[kwcvrobot]

Fletch KWIVER against Fletch Linux build succeeded.

[kwcvrobot]

Fletch KWIVER against Fletch Mac build succeeded.

[dstoup]

Good call ... I was going to set out to do this PR soon. Thanks!

Before we merge, it would be good to create a throwaway PR that sets 3.2.1 as the default so we can make sure it builds and more importantly, that kwiver can use it. Keeping 2.3.2 as the default for the merge is the right thing though.

[dstoup]

I set out to make a new PR from this one so we can actually test the new version. The first thing we will need is a geotiff update to version 1.5.0. I think I have a PR that does that but it needed some fixes. I will see if I can get that pushed.

[dstoup]

I've made two PR's targeting master that will allow GDAL v3 to build as the default. Once they land, I will push up a quick PR to test GDAL 3 as default, then we should merge this. Eager to get it landed as an option.