[Merge] ~jamesh/pulseaudio:module-snap-policy into ~ubuntu-audio-dev/pulseaudio:ubuntu

[James Henstridge]

As discussed on IRC, I've dropped the trust-store specific patches (which haven't been built since February according to bug 1739469), keeping the patches necessary for the snap policy module to hook in.
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https://code.launchpad.net/~jamesh/pulseaudio/+git/pulseaudio/+merge/352558
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