avformat/Makefile: Add missing rawenc dependency for iLBC muxer

Forgotten in ab502fab.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

libavformat/Makefile

@@ -239,7 +239,7 @@ OBJS-$(CONFIG_IDF_DEMUXER)               += bintext.o sauce.o
 OBJS-$(CONFIG_IFF_DEMUXER)               += iff.o
 OBJS-$(CONFIG_IFV_DEMUXER)               += ifv.o
 OBJS-$(CONFIG_ILBC_DEMUXER)              += ilbc.o
-OBJS-$(CONFIG_ILBC_MUXER)                += ilbc.o
+OBJS-$(CONFIG_ILBC_MUXER)                += ilbc.o rawenc.o
 OBJS-$(CONFIG_IMAGE2_DEMUXER)            += img2dec.o img2.o
 OBJS-$(CONFIG_IMAGE2_MUXER)              += img2enc.o img2.o
 OBJS-$(CONFIG_IMAGE2PIPE_DEMUXER)        += img2dec.o img2.o