[Merge] ~liushuyu-011/ubuntu/+source/davmail:ubuntu/devel into ubuntu/+source/davmail:ubuntu/devel

[Graham Inggs]

I filed https://bugs.debian.org/1043143 about this.

I think it should be policy for autopkgtests not to depend on virtual packages (similar to how real packages must be listed before virtual alternatives in Build-Depends).

I'll try to get this policy accepted in Debian.
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https://code.launchpad.net/~liushuyu-011/ubuntu/+source/davmail/+git/davmail/+merge/448108
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