Fix warnings:
cfg-common.h:386: warning: redundant redeclaration of 'audio_stream'
stream/stream.h:301: warning: previous declaration of 'audio_stream' was here

Index: mplayer/cfg-common.h
===================================================================
--- mplayer/cfg-common.h	(revision 24384)
+++ mplayer/cfg-common.h	(working copy)
@@ -385,7 +383,6 @@
 extern m_option_t demux_rawvideo_opts[];
 extern m_option_t cdda_opts[];
 
-extern char* audio_stream;
 extern char* sub_stream;
 extern int demuxer_type, audio_demuxer_type, sub_demuxer_type;
 extern int ts_prog;