Add new state for unplugged sound cards.

git-svn-id: svn+ssh://svn.savannah.nongnu.org/linphone/trunk@411 3f6dc0c8-ddfe-455d-9043-3cd528dc4637

linphone/mediastreamer2/include/mediastreamer2/mssndcard.h

@@ -103,6 +103,7 @@ struct _MSSndCardDesc{
  */
 typedef struct _MSSndCardDesc MSSndCardDesc;
 
+#define MS_SND_CARD_CAP_DISABLED (0)
 #define MS_SND_CARD_CAP_CAPTURE (1)
 #define MS_SND_CARD_CAP_PLAYBACK (1<<1)