aacdec: Rename avccontext to avctx.

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@23488 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavcodec/aac.h

@@ -241,7 +241,7 @@ typedef struct {
  * main AAC context
  */
 typedef struct {
-    AVCodecContext * avccontext;
+    AVCodecContext * avctx;
 
     MPEG4AudioConfig m4ac;