Fix C++ QRCode example#526

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ManuelSchmitzberger wants to merge 2 commits intospmallick:masterfrom

ManuelSchmitzberger:master

Commits on Dec 8, 2020

Reduce opencv libs only to the required one in the QRCode example.
Manuel Schmitzberger
committed

Commits on Dec 9, 2020

Fix drawing lines in result image in QRcode example.
Manuel Schmitzberger
committed