Backport of "deinterlace: force -DPREFIX on macos" into 1.18
Backport of !845 (merged) "deinterlace: force -DPREFIX on macos".
Commits:
- 219b6593 deinterlace: force -DPREFIX on macos
Backport of !845 (merged) "deinterlace: force -DPREFIX on macos".
Commits: