Rename _t struct types in audio_coding.

_t names are reserved in POSIX.

R=henrik.lundin@webrtc.org
BUG=162

Review URL: https://webrtc-codereview.appspot.com/34509004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@7933 4adac7df-926f-26a2-2b94-8c16560cd09d

webrtc/modules/audio_coding/codecs/ilbc/encode.c

@@ -45,7 +45,7 @@
 void WebRtcIlbcfix_EncodeImpl(
     uint16_t *bytes,     /* (o) encoded data bits iLBC */
     const int16_t *block, /* (i) speech vector to encode */
-    iLBC_Enc_Inst_t *iLBCenc_inst /* (i/o) the general encoder
+    IlbcEncoder *iLBCenc_inst /* (i/o) the general encoder
                                      state */
                           ){
   int n, meml_gotten, Nfor, Nback;