Fix build with later versions of OpenCV 3 #644
Merged
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This first regressed in #534. Support for OpenCV 3.2 was re-added in #564. This fixes the build with OpenCV 3.3 and newer.
Original change was here: bb4c2db#diff-2478c8be1a7ff3c6e582de5e1e738cc05c22dd7fcbdb3599a1999ab849045517
RHEL 8 uses OpenCV 3.4.6.