[ffmpeg/f24] (12 commits) ...enable optional support for many external libraries (rfbz#4109)

[Dominik Mierzejewski]

Summary of changes:

  fd2420b... test (*)
  ad0b99a... Fixed build failure on rawhide due to newer opencv using a  (*)
  d59ad3d... enable jack by default (rfbz#2156) (*)
  7016e63... re-enable opencl by default (rfbz#3640 was fixed) (*)
  ba48e67... add conditional support for QSV via libmfx (rfbz#4043) (*)
  30a5b93... drop libcelt support (*)
  f349d0c... drop libdirac support (unsupported by FFmpeg) (*)
  1c68673... make xvidcore support optional (*)
  85f7946... add missing ldconfig calls for libavdevice package (*)
  43281f1... move examples from main package to -devel as docs (*)
  339f85b... make DV (IEEE 1394) support optional (*)
  7cfce40... enable optional support for many external libraries (rfbz#4 (*)

(*) This commit already existed in another branch; no separate mail sent