Backport of "opencv: Allow building against 4.6.x" into 1.20
Backport of !2557 (merged) "opencv: Allow building against 4.6.x".
Commits:
- d86ad30b opencv: Allow building against 4.6.x
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Backport of !2557 (merged) "opencv: Allow building against 4.6.x".
Commits: