message: cmake: allow to specify own libva paths
  via CMake:
  `-DVA_LIBRARIES=/opt/intel/mediasdk/lib64/libva.so.2\;/opt/intel/mediasdk/lib64/libva-drm.so.2`
diff: @@ -12,7 +12,9 @@ endif()
  if(VA_INCLUDE_DIR)
  set(HAVE_VA TRUE)
  - set(VA_LIBRARIES "-lva" "-lva-drm")
  + if(NOT DEFINED VA_LIBRARIES)
  + set(VA_LIBRARIES "va" "va-drm")
  + endif()
  else()
  set(HAVE_VA FALSE)
  message(WARNING "libva installation is not found.")
  