multimedia/dav1d: drop i386 workaround after 17e9745faede
https://code.videolan.org/videolan/dav1d/-/commit/0d6a31f275dc
This reverts commit f61964ecbf440af33a9a6bc994c8b565e3157c1f.
(cherry picked from commit 1214ea437bbb32aeace933d200603ef1ecd24fda)