Log:
	Set CODEC_CAP_SUBFRAMES for adpcm decoders

	This makes ffmpeg stop printing millions of
	  Multiple frames in a packet from stream 0
	when decoding adpcm.
Reason: adpcm has no subframes, the flag does not belong there


git-svn-id: file:///var/local/repositories/ffmpeg/trunk@21481 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b