Don't declare a pcm_dvd encoder.
The PCM_DVD encoder would be left unused, as allcodecs.c properly declared
it as being decoder-only, but it would still be built into the object file.
Since there is no block of code to properly encode this PCM format, it's
not a full codec.
Signed-off-by: Mans Rullgard <firstname.lastname@example.org>
(cherry picked from commit 5b5083b5fed1e0b0d8f3c6f2c21bdc915b1226f6)