10:53 Tobias C. Berner (tcberner) 

graphics/opencv: update to 4.5.3

Changes in the port:
- fix prefetch of third party software
        - prefetching of distfiles has been fixed
	- cmake will now throw an error in ocv_download()
	  if it is still called
- minor cleanup

- next step: readd some more options, and improve port for
  non-poudriere users

PR:		256669

    43a30a3

18:08 tcberner 

graphics/opencv: update to 4.5.1 -- and make port more easily maintainable

This is a major upgrade from 3.x to 4.x.

Changelog from versions 3.4.1--4.5.1 can be found here:
    https://github.com/opencv/opencv/wiki/ChangeLog

Note: this has explicitely not been added as a new graphics/opencv4 port, but
replaces the
      previous graphics/opencv[3] port. Again, to improve maintainability by not
giving ports
      the option to pick the "wrong one" - this leads however to some abandoned
ports being
      broken.

The port has been greatly simplified:
    * graphics/opencv-core which existed to enable ffmpeg to depend on opencv,
and vice versa
      has been removed. ffmpeg no longer can depend on opencv.

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