Bug#864028: stretch-pu: package flatpak 0.8.7-1~deb9u1

[Simon McVittie <smcv@debian.org>]

Hi,
Now that stretch r1 is out, can this update be considered for r2?

Filtered diff (patched tree in security vs. what I propose) in
https://lists.debian.org/debian-release/2017/07/msg00555.html aka
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=864028#57 aka
Message-ID: <[🔎] 20170715163609.nemdxrefaeirdizh@perpetual.pseudorandom.co.uk>.
Notes on the differences and what I filtered are in the same mail.

I would also be happy to add the equivalent of
https://anonscm.debian.org/git/collab-maint/flatpak.git/diff/?id=debian/0.8.7-2&id2=debian/0.8.7-1
to make this flatpak compatible with buster's libostree, if the SRMs
would be OK with that; that would turn it into 0.8.7-2~deb9u1. The
relevant commits will be in upstream release 0.8.8 eventually.

Thanks,
    S