configure: Remove obsolete mpeg4_decoder->mpeg4video_parser dependency

Obsolete since 3ceffe783965767e62d59e8e68ecd265c98460ec.

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

configure

@@ -3015,7 +3015,7 @@ mpeg1video_decoder_select="mpegvideodec"
 mpeg1video_encoder_select="mpegvideoenc"
 mpeg2video_decoder_select="mpegvideodec"
 mpeg2video_encoder_select="mpegvideoenc"
-mpeg4_decoder_select="h263_decoder mpeg4video_parser"
+mpeg4_decoder_select="h263_decoder"
 mpeg4_encoder_select="h263_encoder qpeldsp"
 msa1_decoder_select="mss34dsp"
 mscc_decoder_select="inflate_wrapper"