configure: add missing h263p decoder dependencies

Should fix ticket #4480
Signed-off-by: James Almer <jamrial@gmail.com>

configure

@@ -2161,6 +2161,7 @@ h261_encoder_select="aandcttables mpegvideoenc"
 h263_decoder_select="error_resilience h263_parser h263dsp mpeg_er mpegvideo qpeldsp"
 h263_encoder_select="aandcttables h263dsp mpegvideoenc"
 h263i_decoder_select="h263_decoder"
+h263p_decoder_select="h263_decoder"
 h263p_encoder_select="h263_encoder"
 h264_decoder_select="cabac golomb h264chroma h264dsp h264pred h264qpel startcode videodsp"
 h264_decoder_suggest="error_resilience"