Comment 0 for bug 1717040

Please backport libzstd 1.3.1 from debian to xenial.

Reason for the backport:
========================
Current version in Xenial is v0.5.1,
it's an experimental version, using its own, incompatible format.
As a consequence, zstd on Ubuntu Xenial is not compatible with the rest of the world.

This is of important concern for products using libzstd as a shared library :
on Ubuntu Xenial, produced data is different, not compatible with v1+.

This issue has been made more pressing with the integration of zstd in Linux Kernel,
as userland tools must also be updated to read and generate zstd.

Note : this request was first improperly filled at : https://bugs.launchpad.net/zesty-backports/+bug/1717037

Testing:
========
Mark off items in the checklist [X] as you test them, but please leave the checklist so that backporters can quickly evaluate the state of testing.

You can test-build the backport in your PPA with backportpackage:
$ backportpackage -u ppa:<lp username>/<ppa name> -s artful -d xenial libzstd

* xenial:
[ ] Package builds without modification
[ ] zstd installs cleanly and runs
[ ] zstd-dbgsym installs cleanly and runs
[ ] libzstd1-dbgsym installs cleanly and runs
[ ] libzstd-dev installs cleanly and runs
[ ] libzstd1 installs cleanly and runs

No reverse dependencies