build: fix build with --disable-encoders

draw_edges() should probably be moved somewhere else to avoid
mpegvideo*enc* dependency to decoders.

configure

@@ -2046,7 +2046,7 @@ cook_decoder_select="audiodsp mdct sinewin"
 cscd_decoder_select="lzo"
 cscd_decoder_suggest="zlib"
 dca_decoder_select="mdct"
-dirac_decoder_select="dsputil dwt golomb videodsp"
+dirac_decoder_select="dsputil dwt golomb videodsp mpegvideoenc"
 dnxhd_decoder_select="blockdsp idctdsp"
 dnxhd_encoder_select="aandcttables blockdsp fdctdsp idctdsp mpegvideoenc pixblockdsp"
 dvvideo_decoder_select="dvprofile idctdsp"
@@ -2155,7 +2155,7 @@ rv30_decoder_select="error_resilience golomb h264chroma h264pred h264qpel mpeg_e
 rv40_decoder_select="error_resilience golomb h264chroma h264pred h264qpel mpeg_er mpegvideo videodsp"
 shorten_decoder_select="golomb"
 sipr_decoder_select="lsp"
-snow_decoder_select="dsputil dwt h264qpel hpeldsp rangecoder"
+snow_decoder_select="dsputil dwt h264qpel hpeldsp rangecoder mpegvideoenc"
 snow_encoder_select="aandcttables dsputil dwt h264qpel hpeldsp mpegvideoenc rangecoder"
 sonic_decoder_select="golomb rangecoder"
 sonic_encoder_select="golomb rangecoder"