Merge pull request #4610 from ritzalam/sign-new-jars

bbb-screenshare/app/jws/lib/ffmpeg-linux-x86_64-svc2.jar

bbb-screenshare/app/jws/lib/ffmpeg-macosx-x86_64-svc2.jar

bbb-screenshare/app/jws/lib/ffmpeg-win-x86-svc2.jar

bbb-screenshare/app/jws/lib/ffmpeg-win-x86_64-svc2.jar

bbb-screenshare/app/jws/lib/ffmpeg.jar

bbb-screenshare/app/jws/lib/javacv-screenshare-0.0.1.jar

...-libs/unsigned-jars/ffmpeg-linux-x86_64-svc2-unsigned.jar

...libs/unsigned-jars/ffmpeg-macosx-x86_64-svc2-unsigned.jar

...ative-libs/unsigned-jars/ffmpeg-win-x86-svc2-unsigned.jar

...ve-libs/unsigned-jars/ffmpeg-win-x86_64-svc2-unsigned.jar