configure: Add (dnxhd|snow)_encoder->videodsp dependency

These encoders currently rely on an implicit dependency via mpegvideo.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

configure

@@ -2811,7 +2811,7 @@ dca_encoder_select="mdct"
 dds_decoder_select="texturedsp"
 dirac_decoder_select="dirac_parse dwt golomb videodsp mpegvideoenc"
 dnxhd_decoder_select="blockdsp idctdsp"
-dnxhd_encoder_select="blockdsp fdctdsp idctdsp mpegvideoenc pixblockdsp"
+dnxhd_encoder_select="blockdsp fdctdsp idctdsp mpegvideoenc pixblockdsp videodsp"
 dolby_e_decoder_select="mdct"
 dvvideo_decoder_select="dvprofile idctdsp"
 dvvideo_encoder_select="dvprofile fdctdsp me_cmp pixblockdsp"
@@ -2947,7 +2947,7 @@ shorten_decoder_select="bswapdsp"
 sipr_decoder_select="lsp"
 smvjpeg_decoder_select="mjpeg_decoder"
 snow_decoder_select="dwt h264qpel hpeldsp me_cmp rangecoder videodsp"
-snow_encoder_select="dwt h264qpel hpeldsp me_cmp mpegvideoenc rangecoder"
+snow_encoder_select="dwt h264qpel hpeldsp me_cmp mpegvideoenc rangecoder videodsp"
 sonic_decoder_select="golomb rangecoder"
 sonic_encoder_select="golomb rangecoder"
 sonic_ls_encoder_select="golomb rangecoder"