* support for AAC audio streams via libfaad

* could be complied with runtime linking of libfaad (CONFIG_FAADBIN)
* missing/untested support for raw AAC streams (maybe there will be
  just one entry for aac)
* missing configure check for libfaad/config option

Originally committed as revision 1857 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/allcodecs.c

@@ -85,6 +85,10 @@ void avcodec_register_all(void)
     register_avcodec(&wmav1_decoder);
     register_avcodec(&wmav2_decoder);
     register_avcodec(&indeo3_decoder);
+#ifdef CONFIG_FAAD
+    register_avcodec(&aac_decoder);
+    register_avcodec(&mpeg4aac_decoder);
+#endif
 #endif
     register_avcodec(&mpeg_decoder);
     register_avcodec(&dvvideo_decoder);