fate: add adpcm_ima_cunning tests

single:               Single-track
track{0,1}:           Dual-track
trunc-t1:             Truncated track 1
trunc-t2-track{0,1}:  Fully-truncated track 2
trunc-t2a-track{0,1}: Partially-truncated track 2
trunc-h2:             Truncated track 2 header

Signed-off-by: Zane van Iperen <zane@zanevaniperen.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>