[MPlayer-dev-eng] do not require /dev/videoX for v4l autodetection

[Jindrich Makovicka]

Sascha Sommer wrote:
> Hi,
> 
> is anyone against changing the configure check so that v4l support
> gets enabled automatically when we are on linux and have the required headers?
> 
> The current check is very anoying when it comes to usb capture cards as 
> /dev/video0 might only be present after plugin.

No problem. I will probably also remove libmpdemux/videodev2.h and add a
proper v4l2 compile check, as newer linux/videodev2.h already works.

-- 
Jindrich Makovicka