[winswitch] [ANNOUNCE] Xpra 3.1.2 regression + packaging fixes

[Antoine Martin]

Hi,

There was backport blooper in 3.1.1 which caused local unix domain 
connections to fail (and therefore connections via a local ssh server 
also failed).
This release just fixes this socket bug and a libvpx encoder issue which 
would error out on odd image dimensions when used in conjunction with 
the libyuv colourspace conversion module.
The other changes are just minor packaging tweaks (ie: Ubuntu Impish, etc).

There are no new builds for MacOS or MS Windows because these platforms 
are not affected.
There is no urgency to update, though updating is recommended for all 
users of the 3.x releases.

The more detailed release notes can be found here:
https://github.com/Xpra-org/xpra/releases/tag/v3.1.2

Downloads:
https://github.com/Xpra-org/xpra/wiki/Download

Cheers,
Antoine