configure: select bswapdsp for mdec decoder

Signed-off-by: Lou Logan <lou@lrcd.com>

configure

@@ -2739,7 +2739,7 @@ ljpeg_encoder_select="idctdsp jpegtables mpegvideoenc"
 lscr_decoder_deps="zlib"
 magicyuv_decoder_select="llviddsp"
 magicyuv_encoder_select="llvidencdsp"
-mdec_decoder_select="blockdsp idctdsp mpegvideo"
+mdec_decoder_select="blockdsp bswapdsp idctdsp mpegvideo"
 metasound_decoder_select="lsp mdct sinewin"
 mimic_decoder_select="blockdsp bswapdsp hpeldsp idctdsp"
 mjpeg_decoder_select="blockdsp hpeldsp exif idctdsp jpegtables"