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