Fix jacosub muxer Makefile dependencies.

Found, analysed and tested by trac user Jamal.

Fixes part of ticket #1428.

libavformat/Makefile

@@ -134,7 +134,7 @@ OBJS-$(CONFIG_IV8_DEMUXER)               += iv8.o
 OBJS-$(CONFIG_IVF_DEMUXER)               += ivfdec.o
 OBJS-$(CONFIG_IVF_MUXER)                 += ivfenc.o
 OBJS-$(CONFIG_JACOSUB_DEMUXER)           += jacosubdec.o
-OBJS-$(CONFIG_JACOSUB_MUXER)             += jacosubenc.o
+OBJS-$(CONFIG_JACOSUB_MUXER)             += jacosubenc.o rawenc.o
 OBJS-$(CONFIG_JV_DEMUXER)                += jvdec.o
 OBJS-$(CONFIG_LATM_DEMUXER)              += rawdec.o
 OBJS-$(CONFIG_LATM_MUXER)                += latmenc.o