v4l sup­port in the lin­ux­u­la­tor MFCed to 8‑stable

I merged the v4l trans­la­tion lay­er into the lin­ux­u­la­tor of 8‑stable. As in ‑cur­rent, this just means that lin­ux apps (like Skype) can now use FreeB­SD native devices which con­form to the v4l ABI. The port multimedia/webcamd pro­vides access to some web­cams (or DVB hard­ware) via the v4l ABI.

Peo­ple which want to test the lin­ux­u­la­tor part should first make sure a native FreeB­SD appli­ca­tion has no prob­lem access­ing the device.