configure: fix zlib dependancy of tdsc

Signed-off-by: NMichael Niedermayer <michaelni@gmx.at>

configure

@@ -2231,8 +2231,7 @@ svq1_encoder_select="aandcttables hpeldsp me_cmp mpegvideoenc"
 svq3_decoder_select="h264_decoder hpeldsp tpeldsp"
 svq3_decoder_suggest="zlib"
 tak_decoder_select="audiodsp"
-tdsc_decoder_deps="zlib"
-tdsc_decoder_select="mjpeg_decoder"
+tdsc_decoder_select="zlib mjpeg_decoder"
 theora_decoder_select="vp3_decoder"
 thp_decoder_select="mjpeg_decoder"
 tiff_decoder_suggest="zlib lzma"