Add pkg-config to apt-get install in build-ubuntu.sh
Add pkg-config to apt-get install in build-ubuntu.sh

kreldjarn/ffmpeg-decklink,kreldjarn/ffmpeg-decklink,zimbatm/ffmpeg-static,zimbatm/ffmpeg-static,michalliu/ffmpeg-static,kreldjarn/ffmpeg-decklink,michalliu/ffmpeg-static,kreldjarn/ffmpeg-static,andreipoe/ffmpeg-static,andreipoe/ffmpeg-static,kreldjarn/ffmpeg-static,kreldjarn/ffmpeg-static,kreldjarn/ffmpeg-decklink,kreldjarn/ffmpeg-static