[FFmpeg-devel] configure: Fix decklink license dependency

[Elliott Balsley]

> On Jan 30, 2019, at 12:53, Carl Eugen Hoyos <ceffmpeg at gmail.com> wrote:
> 
> Imo, it is different in (nearly) every regard but as said, I don't see
> how this discussion can be fruitful in any way.
> 
If anyone else has an opinion, I would love to learn why Nvidia driver is considered a system library under GPL while Decklink driver is not. They are both closed source drivers required to run a hardware device. Nvidia driver is required to use nvenc, which does not need the nonfree flag.