[Merge] lp:~ubuntu-mate-dev/ubuntu-themes/mate-compatibility into lp:ubuntu-themes

[Sebastien Bacher]

Review: Disapprove

When discussed on #ubuntu-desktop it seemed like the consensus was that we didn't want more code in our themes to support other desktop, you should rather make your own theme variant there
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https://code.launchpad.net/~ubuntu-mate-dev/ubuntu-themes/mate-compatibility/+merge/262334
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