modemmanager: 1.7.990 -> 1.10.0
modemmanager: 1.7.990 -> 1.10.0

* Add flags for systemd [0]

* Enable tests
  Though I actually didn't look to see how they're
  performed, only effort done was to get a success-
  ful build.

* Enable vala bindings

[0]: https://gitlab.freedesktop.org/mobile-broadband/ModemManager/blob/1.8.0/NEWS#L21

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