Optional update for Chromium dependencies

This update contains a number of updated dependencies for Chromium, including ffmpeg 4.

New package ffmpeg-4:

- Builds ffmpeg 4 libraries

New package ffmpeg-3:

- Builds ffmpeg 3 libraries and command line utilities

Changes in zeromq, codec2, libsodium:

- baselibs.conf changes required for ffmpeg 4

This update was imported from the openSUSE:Leap:15.0:Update update project.

Fixed bugs
Chromium 67.0.3396.62 video playback regression
Selected Binaries
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