Merge commit 'cc4992aaf3dbb0af88d9727983d75636baf1f8cc'

* commit 'cc4992aaf3dbb0af88d9727983d75636baf1f8cc':
  ac3enc: allow Dolby Pro Logic IIz as the Dolby Surround EX mode.

Merged-by: Michael Niedermayer <michaelni@gmx.at>

diff --cc libavcodec/ac3enc.h
Simple merge

diff --cc libavcodec/ac3enc_opts_template.c
Simple merge