contrib: use videolan git URL variable
- use videolan contrib variable for breakpad URL
- add and use videolan git url for ffmpeg, nvcodec and x262
Most notably, this changes the ffmpeg giturl from http to https, and the x262 url from git to https.
Most notably, this changes the ffmpeg giturl from http to https, and the x262 url from git to https.
VideoLAN code repository instance