Mark SAMPLE_FMT_S24 as deprecated.

Originally committed as revision 14823 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/avcodec.h

@@ -345,7 +345,7 @@ enum SampleFormat {
     SAMPLE_FMT_NONE = -1,
     SAMPLE_FMT_U8,              ///< unsigned 8 bits
     SAMPLE_FMT_S16,             ///< signed 16 bits
-    SAMPLE_FMT_S24,             ///< signed 24 bits
+    SAMPLE_FMT_S24,             ///< signed 24 bits @deprecated Deprecated in favor of SAMPLE_FMT_S32
     SAMPLE_FMT_S32,             ///< signed 32 bits
     SAMPLE_FMT_FLT,             ///< float
     SAMPLE_FMT_NB               ///< Number of sample formats. DO NOT USE if dynamically linking to libavcodec