Add libv4l2 to the pkg-config in order not to fail linking ffmpeg to nvmpi.so on the environments that doesn't support linking shared libs "like a chain" #78
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On Ubuntu the linker refers to rpath location by default. But when other environments like openembedded+bitbake or something like this, it is not. Adding libv4l2 to the Requires in pkg-config is essential since the program is slightly dependent on v4l2 function and lacking it can cause an issue on linking.