Update SWIG symbols.i for WebRTC AEC3 (#3148)

pjsip-apps/src/swig/symbols.i

@@ -217,16 +217,18 @@ typedef enum pjmedia_echo_flag
   PJMEDIA_ECHO_SPEEX = 1,
   PJMEDIA_ECHO_SIMPLE = 2,
   PJMEDIA_ECHO_WEBRTC = 3,
+  PJMEDIA_ECHO_WEBRTC_AEC3 = 4,
   PJMEDIA_ECHO_ALGO_MASK = 15,
   PJMEDIA_ECHO_NO_LOCK = 16,
   PJMEDIA_ECHO_USE_SIMPLE_FIFO = 32,
   PJMEDIA_ECHO_USE_SW_ECHO = 64,
   PJMEDIA_ECHO_USE_NOISE_SUPPRESSOR = 128,
+  PJMEDIA_ECHO_USE_GAIN_CONTROLLER = 256,
   PJMEDIA_ECHO_AGGRESSIVENESS_DEFAULT = 0,
-  PJMEDIA_ECHO_AGGRESSIVENESS_CONSERVATIVE = 0x100,
-  PJMEDIA_ECHO_AGGRESSIVENESS_MODERATE = 0x200,
-  PJMEDIA_ECHO_AGGRESSIVENESS_AGGRESSIVE = 0x300,
-  PJMEDIA_ECHO_AGGRESSIVENESS_MASK = 0xF00
+  PJMEDIA_ECHO_AGGRESSIVENESS_CONSERVATIVE = 0x1000,
+  PJMEDIA_ECHO_AGGRESSIVENESS_MODERATE = 0x2000,
+  PJMEDIA_ECHO_AGGRESSIVENESS_AGGRESSIVE = 0x3000,
+  PJMEDIA_ECHO_AGGRESSIVENESS_MASK = 0xF000
 } pjmedia_echo_flag;
 
 typedef enum pjmedia_event_type