Update setup_opencv.sh to work on Fedora Linux

[yuripourre]

No description provided.

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[yuripourre]

@googlebot I signed it!

[jiuqiant]

Thanks for reporting this. Fixed in our internal code base upstream, and will be pushed to GitHub in the next release.

[yuripourre]

Thank you @jiuqiant

[jiuqiant]

Merged in 6abec12.