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/webrtc@7933 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/modules/audio_coding/codecs/ilbc/lpc_encode.h b/modules/audio_coding/codecs/ilbc/lpc_encode.h
index 8d87b0a..9f6f504 100644
--- a/modules/audio_coding/codecs/ilbc/lpc_encode.h
+++ b/modules/audio_coding/codecs/ilbc/lpc_encode.h
@@ -32,7 +32,7 @@
                                    before/after encoding */
     int16_t *lsf_index,  /* (o) lsf quantization index */
     int16_t *data,   /* (i) Speech to do LPC analysis on */
-    iLBC_Enc_Inst_t *iLBCenc_inst
+    IlbcEncoder *iLBCenc_inst
     /* (i/o) the encoder state structure */
                              );