added HAVE_AV_CONFIG_H

Originally committed as revision 19 to svn://svn.ffmpeg.org/ffmpeg/trunk

libav/Makefile

 include ../config.mak
-CFLAGS= $(OPTFLAGS) -Wall -g -I../libavcodec
+CFLAGS= $(OPTFLAGS) -Wall -g -I../libavcodec -DHAVE_AV_CONFIG_H
 
 OBJS= rm.o mpeg.o asf.o avienc.o jpegenc.o swf.o wav.o raw.o \
 	 avidec.o ffm.o \

libavcodec/common.h

 #ifndef COMMON_H
 #define COMMON_H
 
+#ifdef HAVE_AV_CONFIG_H
 #include "../config.h"
+#endif
 
 #ifndef __WINE_WINDEF16_H
 /* workaround for typedef conflict in MPlayer (wine typedefs) */