[Ubuntu] Fixing CVE-2016-9839 & CVE-2017-5522 for mapserver

[Sebastiaan Couwenberg]

The mapserver packages in the UbuntuGIS PPAs have been updated to fix
the recent security issues.

The fixed packages should be available shortly:

 * mapserver (7.0.4-1~xenial1)
 * mapserver (7.0.4-1~trusty1)
 * mapserver (6.4.2-1~precise3)

I've also prepared updates for the packages in Ubuntu, see:

 https://bugs.launchpad.net/ubuntu/+source/mapserver/+bug/1648998/comments/2

Unfortunately I cannot send Canonical a bill for my time, because they
don't maintain most the packages they take from Debian :-(

Kind Regards,

Bas

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