avcodec/wavpack: increase WV_MAX_SAMPLES

This is maximal number of samples per frame that current wavpack
can create.

Signed-off-by: Paul B Mahol <onemda@gmail.com>
fate/vpx: make webm dash manifest tests depend on the WEBM_DASH_MANIFEST demuxer

Found-by: James Almer <jamrial@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avformat/webmdashenc: use av_strlcpy() and allocate enough space

Fixes out of array read

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