avformat/Makefile: add missing pcm dependency to sdx demuxer

Signed-off-by: Lou Logan <lou@lrcd.com>
Signed-off-by: Carl Eugen Hoyos <ceffmpeg@gmail.com>

libavformat/Makefile

@@ -470,7 +470,7 @@ OBJS-$(CONFIG_SCC_MUXER)                 += sccenc.o subtitles.o
 OBJS-$(CONFIG_SDP_DEMUXER)               += rtsp.o
 OBJS-$(CONFIG_SDR2_DEMUXER)              += sdr2.o
 OBJS-$(CONFIG_SDS_DEMUXER)               += sdsdec.o
-OBJS-$(CONFIG_SDX_DEMUXER)               += sdxdec.o
+OBJS-$(CONFIG_SDX_DEMUXER)               += sdxdec.o pcm.o
 OBJS-$(CONFIG_SEGAFILM_DEMUXER)          += segafilm.o
 OBJS-$(CONFIG_SEGAFILM_MUXER)            += segafilmenc.o
 OBJS-$(CONFIG_SEGMENT_MUXER)             += segment.o