Rename spdif.c as spdifenc,c to prepare for future spdif demuxer.

Patch by Anssi Hannula, anssi d hannula a iki d fi

Originally committed as revision 25713 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/Makefile

@@ -256,7 +256,7 @@ OBJS-$(CONFIG_SMACKER_DEMUXER)           += smacker.o
 OBJS-$(CONFIG_SOL_DEMUXER)               += sol.o pcm.o
 OBJS-$(CONFIG_SOX_DEMUXER)               += soxdec.o pcm.o
 OBJS-$(CONFIG_SOX_MUXER)                 += soxenc.o
-OBJS-$(CONFIG_SPDIF_MUXER)               += spdif.o
+OBJS-$(CONFIG_SPDIF_MUXER)               += spdifenc.o
 OBJS-$(CONFIG_SRT_DEMUXER)               += srtdec.o
 OBJS-$(CONFIG_SRT_MUXER)                 += rawenc.o
 OBJS-$(CONFIG_STR_DEMUXER)               += psxstr.o