fix compilation with --disable-everything --enable-muxer=mpegts

Originally committed as revision 22480 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/Makefile

@@ -491,7 +491,7 @@ OBJS-$(CONFIG_MATROSKA_DEMUXER)        += mpeg4audio.o
 OBJS-$(CONFIG_MATROSKA_MUXER)          += xiph.o mpeg4audio.o \
                                           flacdec.o flacdata.o flac.o
 OBJS-$(CONFIG_MOV_DEMUXER)             += mpeg4audio.o mpegaudiodata.o
-OBJS-$(CONFIG_MPEGTS_MUXER)            += mpegvideo.o
+OBJS-$(CONFIG_MPEGTS_MUXER)            += mpegvideo.o mpeg4audio.o
 OBJS-$(CONFIG_NUT_MUXER)               += mpegaudiodata.o
 OBJS-$(CONFIG_OGG_DEMUXER)             += flacdec.o flacdata.o flac.o \
                                           dirac.o mpeg12data.o