Fix standalone compilation of the amv encoder.

configure

@@ -2019,7 +2019,7 @@ als_decoder_select="bswapdsp"
 amrnb_decoder_select="lsp"
 amrwb_decoder_select="lsp"
 amv_decoder_select="sp5x_decoder exif"
-amv_encoder_select="aandcttables"
+amv_encoder_select="aandcttables mpegvideoenc"
 ape_decoder_select="bswapdsp llauddsp"
 asv1_decoder_select="blockdsp bswapdsp idctdsp"
 asv1_encoder_select="bswapdsp dsputil"

libavcodec/Makefile

@@ -122,7 +122,7 @@ OBJS-$(CONFIG_AMRWB_DECODER)           += amrwbdec.o celp_filters.o   \
                                           celp_math.o acelp_filters.o \
                                           acelp_vectors.o             \
                                           acelp_pitch_delay.o
-OBJS-$(CONFIG_AMV_ENCODER)             += mjpegenc.o mjpeg.o           \
+OBJS-$(CONFIG_AMV_ENCODER)             += mjpegenc.o mjpeg.o mjpegenc_common.o \
                                           mpegvideo_enc.o motion_est.o \
                                           ratecontrol.o mpeg12data.o   \
                                           mpegvideo.o