[Ubuntu] ZSTD Support GDAL 2.4/2.4.2

[Even Rouault]

Bas,

>From what I see in https://salsa.debian.org/debian-gis-team/gdal/blob/master/
debian/rules, Debian builds GDAL against external/system libtiff, right ?

If so, libtiff must be built itself against libzstd, but I don't see it 
mentionned as a dependency of libtiff in
https://packages.debian.org/sid/libtiff-dev

Note: if libtiff is rebuilt with zstd support, this wouldn't require a rebuild 
of GDAL, as it discovers dynamically if libtiff has ZSTD support.

Even

> On 2019-08-08 08:58, Zhen Wang wrote:
> > Using gdal ubuntugis-stable and ubuntugis-unstable, but both seems to
> > not
> > have ZSTD compression enabled ?
> 
> zstd support was added in gdal (2.3.0~beta1+dfsg-1).
> 
> The buildlog also shows that it's enabled, see:
> 
> 
> https://launchpadlibrarian.net/433196709/buildlog_ubuntu-bionic-amd64.gdal_2
> .4.2+dfsg-1~bionic0_BUILDING.txt.gz
> 
> You may be doing something wrong, or the version of the data is newer
> than supported by zstd in Ubuntu.
> 
> Kind Regards,
> 
> Bas
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