cosmetics: Put audio (de)muxer entries in alphabetical order.

Originally committed as revision 8614 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/Makefile

@@ -22,6 +22,8 @@ OBJS-$(CONFIG_ASF_MUXER)                 += asf-enc.o riff.o
 OBJS-$(CONFIG_ASF_STREAM_MUXER)          += asf-enc.o riff.o
 OBJS-$(CONFIG_AU_DEMUXER)                += au.o riff.o
 OBJS-$(CONFIG_AU_MUXER)                  += au.o riff.o
+OBJS-$(CONFIG_AUDIO_DEMUXER)             += audio.o
+OBJS-$(CONFIG_AUDIO_MUXER)               += audio.o
 OBJS-$(CONFIG_AVI_DEMUXER)               += avidec.o riff.o
 OBJS-$(CONFIG_AVI_MUXER)                 += avienc.o riff.o
 OBJS-$(CONFIG_AVISYNTH)                  += avisynth.o
@@ -150,9 +152,6 @@ ifeq ($(CONFIG_BKTR),yes)
 OBJS-$(CONFIG_VIDEO_GRAB_DEVICE_DEMUXER) += grab_bktr.o
 endif
 
-OBJS-$(CONFIG_AUDIO_DEMUXER)             += audio.o
-OBJS-$(CONFIG_AUDIO_MUXER)               += audio.o
-
 EXTRALIBS := -L$(BUILD_ROOT)/libavutil -lavutil$(BUILDSUF) \
              -lavcodec$(BUILDSUF) -L$(BUILD_ROOT)/libavcodec $(EXTRALIBS)