Merge commit '2613de88'

We dont use au_read_packet() anymore and block_align is already set.
Thus nothing had to be merged from these.

* commit '2613de88':
  au: do not set pkt->size directly
  au: set block_align and use it in au_read_packet()

Conflicts:
	libavformat/au.c
Merged-by: Michael Niedermayer <michaelni@gmx.at>