FATE: add test for SMJPEG demuxer and associated IMA ADPCM audio decoder.

(Don't attempt to decode JPEG data.)
Code coverage: libavformat/smjpeg.c: 0% -> 69%
libavcodec/adpcm.c: 0% -> 10% (fresh run); 92.4% -> 93% following a FATE run
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>

tests/fate/demux.mak

@@ -79,6 +79,9 @@ fate-sierra-vmd: CMD = framecrc -i $(SAMPLES)/vmd/12.vmd -vsync 0 -pix_fmt rgb24
 FATE_TESTS += fate-siff
 fate-siff: CMD = framecrc -i $(SAMPLES)/SIFF/INTRO_B.VB -t 3 -pix_fmt rgb24
 
+FATE_TESTS += fate-smjpeg
+fate-smjpeg: CMD = framecrc -i $(SAMPLES)/smjpeg/scenwin.mjpg -vcodec copy
+
 FATE_TESTS += fate-westwood-aud
 fate-westwood-aud: CMD = md5 -i $(SAMPLES)/westwood-aud/excellent.aud -f s16le