WIP: [scout] Platform: Add python3.5

Simon McVittie requested to merge wip/scout/t18302 into steamrt/scout

Proton's launch script wants Python 3, and we already have a python3.5 backport for Meson, so we might as well use that more modern version.

Because we aren't installing the default Python 3 version (3.2), this will need to be accompanied by a flatdeb-steam commit (flatdeb-steam!5 (merged)) to set up a /usr/bin/python3 symlink.


https://phabricator.collabora.com/T18302

/cc @timo @denittis @jpwhiting

Edited by Simon McVittie

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