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
diff --git a/webrtc/modules/audio_coding/codecs/ilbc/encode.h b/webrtc/modules/audio_coding/codecs/ilbc/encode.h
index 5a47c58..fe6ae62 100644
--- a/webrtc/modules/audio_coding/codecs/ilbc/encode.h
+++ b/webrtc/modules/audio_coding/codecs/ilbc/encode.h
@@ -28,7 +28,7 @@
 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 */
                           );