Possible fixes: Either make vlc require libvpx-1.7 instead of libvpx-1.8 with no other changes.
Or patch vlc to not use the newly removed constants. Reading the vlc commit log, they say that they removed those because they were unused anyway--so it shouldn't have a negative impact. I've posted the latter patch to vlc-devel. I've done the former to guix master for now.
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