Log Message:
opencv: updated to 3.4.6

version:3.4.6
OpenCV 3.4.6 has been released. Bug fixes, optimizations and other enhancements \ 
are propagated into OpenCV 4.1.0.

version:3.4.5
OpenCV 3.4.5 has been released. Bug fixes, optimizations and other enhancements \ 
are propagated into OpenCV 4.0.1.

version:3.4.4
OpenCV 3.4.4 has been released. This is a mantenance release. New features are \ 
landed in OpenCV 4.0.

version:3.4.3
OpenCV 3.4.3 has been released, with further extended dnn module, documentation \ 
improvements, some other new functionality and bug fixes.

version:3.4.2
OpenCV 3.4.2 has been released, with further extended dnn module, documentation \ 
improvements, some other new functionality and bug fixes.
OpenCV 3.4.x development is switched from "master" to "3.4" \ 
branch. "master" branch is used for development of upcoming OpenCV 4.x \ 
releases.
Bugfixes / optimizations / small improvemets should go into "3.4" \ 
branch. We will merge changes from "3.4" into "master" \ 
regularly (weekly/bi-weekly).