build: Add missing build rules for the ISMV muxer

libavcodec/Makefile

@@ -570,6 +570,7 @@ OBJS-$(CONFIG_FLAC_MUXER)              += flacdec.o flacdata.o flac.o
 OBJS-$(CONFIG_FLV_DEMUXER)             += mpeg4audio.o
 OBJS-$(CONFIG_GXF_DEMUXER)             += mpeg12data.o
 OBJS-$(CONFIG_IFF_DEMUXER)             += iff.o
+OBJS-$(CONFIG_ISMV_MUXER)              += mpeg4audio.o mpegaudiodata.o
 OBJS-$(CONFIG_LATM_MUXER)              += mpeg4audio.o
 OBJS-$(CONFIG_MATROSKA_AUDIO_MUXER)    += xiph.o mpeg4audio.o \
                                           flacdec.o flacdata.o flac.o

libavformat/Makefile

@@ -118,6 +118,9 @@ OBJS-$(CONFIG_IMAGE2PIPE_DEMUXER)        += img2dec.o img2.o
 OBJS-$(CONFIG_IMAGE2PIPE_MUXER)          += img2enc.o img2.o
 OBJS-$(CONFIG_INGENIENT_DEMUXER)         += ingenientdec.o rawdec.o
 OBJS-$(CONFIG_IPMOVIE_DEMUXER)           += ipmovie.o
+OBJS-$(CONFIG_ISMV_MUXER)                += movenc.o isom.o avc.o       \
+                                            movenchint.o rtpenc_chain.o \
+                                            mov_chan.o
 OBJS-$(CONFIG_ISS_DEMUXER)               += iss.o
 OBJS-$(CONFIG_IV8_DEMUXER)               += iv8.o
 OBJS-$(CONFIG_IVF_DEMUXER)               += ivfdec.o