avcodec/Makefile: Fix opus parser dependency.

The opus.c file uses ff_celt_freq_range and ff_celt_freq_bands which are
defined in opustab.c.  The opus parser needs to include that file to
avoid linker errors when not including the opus encoder/decoder.
Signed-off-by: Jacob Trimble <modmaker@google.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavcodec/Makefile

@@ -1005,7 +1005,7 @@ OBJS-$(CONFIG_PNG_PARSER)              += png_parser.o
 OBJS-$(CONFIG_MPEGAUDIO_PARSER)        += mpegaudio_parser.o
 OBJS-$(CONFIG_MPEGVIDEO_PARSER)        += mpegvideo_parser.o    \
                                           mpeg12.o mpeg12data.o
-OBJS-$(CONFIG_OPUS_PARSER)             += opus_parser.o opus.o vorbis_data.o
+OBJS-$(CONFIG_OPUS_PARSER)             += opus_parser.o opus.o opustab.o vorbis_data.o
 OBJS-$(CONFIG_PNG_PARSER)              += png_parser.o
 OBJS-$(CONFIG_PNM_PARSER)              += pnm_parser.o pnm.o
 OBJS-$(CONFIG_RV30_PARSER)             += rv34_parser.o