intel/libva 1.8.3.pre1

Preliminary release for packaging libva-1.8.3.pre1

on GitHub

• Bump libva to 1.8.3.pre1
• Fix build issue on Android
• Remove the dummy driver
• Add traces for MB rate control / temporal layer
• Set verbosity level between {0, 1, 2} by setting the variable LIBVA_MESSAGING_LEVEL
  in /etc/libva.conf or by setting the environment variable LIBVA_MESSAGING_LEVEL.

git tag: 1.8.3.pre1
sha1sum: b2478e01e268a9113dc3704edcd012bb5d0ac415 libva-1.8.3.pre1.tar.bz2