build fix: apetag.c depends on img2.c

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/Makefile

@@ -62,7 +62,7 @@ OBJS-$(CONFIG_ADF_DEMUXER)               += bintext.o sauce.o
 OBJS-$(CONFIG_ADP_DEMUXER)               += adp.o
 OBJS-$(CONFIG_ADX_DEMUXER)               += adxdec.o
 OBJS-$(CONFIG_ADX_MUXER)                 += rawenc.o
-OBJS-$(CONFIG_ADTS_MUXER)                += adtsenc.o apetag.o
+OBJS-$(CONFIG_ADTS_MUXER)                += adtsenc.o apetag.o img2.o
 OBJS-$(CONFIG_AEA_DEMUXER)               += aea.o pcm.o
 OBJS-$(CONFIG_AFC_DEMUXER)               += afc.o
 OBJS-$(CONFIG_AIFF_DEMUXER)              += aiffdec.o pcm.o isom.o \