temporary change to compile against ffmpeg 4

3 jobs for ffmpeg-4 in 5 minutes and 35 seconds (queued for 7 seconds)
Name Stage Failure
failed
build_macosx_36 Build
(15:49:31.529) export CURL_CA_BUNDLE=/Users/gitlab/builds/b6d3167a/0/bob/bob.io.video/_ci/cacert.pem
(15:49:31.534)
export SSL_CERT_FILE=/Users/gitlab/builds/b6d3167a/0/bob/bob.io.video/_ci/cacert.pem
(15:49:31.539)
export GIT_SSL_CAINFO=/Users/gitlab/builds/b6d3167a/0/bob/bob.io.video/_ci/cacert.pem
(15:49:31.544)
export DOC_SERVER_PREFIX=public-upload/docs/bob/bob.io.video
(15:49:31.548)
DOC_UPLOADS=public-upload/docs/bob/bob.io.video/ffmpeg-4/
(15:49:31.554)
export LANG=en_US.UTF-8
(15:49:31.559)
export LC_ALL=en_US.UTF-8
(15:49:31.565)
export MATPLOTLIBRC=/Users/gitlab/builds/b6d3167a/0/bob/bob.io.video/_ci
ERROR: Job failed: exit status 1