multimedia/dav1d: drop LTO workaround after 17e9745faede
Obsoleted by -mstackrealign removal in
https://code.videolan.org/videolan/dav1d/-/commit/0d6a31f275dc
PR: 292573
Suggested by: diizzy
(cherry picked from commit 5c17e046a864d7cb02aa7c69cbf04353816ae72c)