Florian Zwoch 88aec3b43c linux-v4l2: Change search strategy for v4l2loopback devices
Instead of trying to open devices /dev/video<0-63> check /dev for
all /dev/videoX devices that are existent in the tree. This allows
finding devices with higher names than 63. E.g. /dev/video100 can
now be found and opened which previously failed.

_GNU_SOURCE #define is introduced for versionsort() which is a GNU
extension.

Fixes #4347.
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