configure: add missing llvidencdsp dependency to MagicYUV encoder

Signed-off-by: James Almer <jamrial@gmail.com>

configure

@@ -2518,6 +2518,7 @@ jv_decoder_select="blockdsp"
 lagarith_decoder_select="llviddsp"
 ljpeg_encoder_select="aandcttables idctdsp jpegtables mpegvideoenc"
 magicyuv_decoder_select="llviddsp"
+magicyuv_encoder_select="llvidencdsp"
 mdec_decoder_select="blockdsp idctdsp mpegvideo"
 metasound_decoder_select="lsp mdct sinewin"
 mimic_decoder_select="blockdsp bswapdsp hpeldsp idctdsp"