Revert "movenc: simplify handling of pcm vs. adpcm vs. other compressed codecs"

      This reverts commit 8e8c51318c1fe4ae61de578f0823b88aa3fe8222.

Fixes Ticket873

Conflicts:

	tests/ref/acodec/pcm_s16be
	tests/ref/acodec/pcm_s24be
	tests/ref/acodec/pcm_s32be
	tests/ref/acodec/pcm_s8
	tests/ref/lavf/mov

Approved-by: Baptiste Coudurier <baptiste.coudurier@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>