[FFmpeg-trac] #7608(build system:new): Add opencv 4 support

[FFmpeg]

#7608: Add opencv 4 support
-------------------------------------+-------------------------------------
             Reporter:  Ilya87       |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:  build        |                  Version:  git-
  system                             |  master
             Keywords:  libopencv    |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:
 1 - pkg-config file for opencv 4 has name opencv4.pc
 2 - even I create a symlink to opencv.pc compilation fails - opencv 4
 doesn't have cxcore.h header:
 fatal error: opencv/cxcore.h: No such file or directory
  #include <opencv/cxcore.h>
 How to reproduce:
 {{{
 ./configure --enable-libopencv
 ffmpeg version git-master
 built on AntergOS x86_64
 }}}
 Patches should be submitted to the ffmpeg-devel mailing list and not this
 bug tracker.

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Ticket URL: <https://trac.ffmpeg.org/ticket/7608>
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