Fix compilation with --disable-vdpau

configure

@@ -1301,9 +1301,11 @@ mpeg4_decoder_select="h263_decoder mpeg4video_parser"
 mpeg4_encoder_select="h263_encoder"
 mpeg_vdpau_decoder_select="vdpau mpegvideo_decoder"
 mpeg1_vdpau_decoder_select="vdpau mpeg1video_decoder"
+mpeg1_vdpau_hwaccel_select="vdpau mpeg1video_decoder"
 mpeg2_crystalhd_decoder_select="crystalhd"
 mpeg2_dxva2_hwaccel_deps="dxva2api_h"
 mpeg2_dxva2_hwaccel_select="dxva2 mpeg2video_decoder"
+mpeg2_vdpau_hwaccel_select="vdpau mpeg2video_decoder"
 mpeg2_vaapi_hwaccel_select="vaapi mpeg2video_decoder"
 mpeg4_crystalhd_decoder_select="crystalhd"
 mpeg4_vaapi_hwaccel_select="vaapi mpeg4_decoder"

libavcodec/mpeg12.c

@@ -2331,7 +2331,7 @@ static int decode_chunks(AVCodecContext *avctx,
                         s2->error_count += s2->thread_context[i]->error_count;
                 }
 
-                if (uses_vdpau(avctx))
+                if (CONFIG_MPEG_VDPAU_DECODER && uses_vdpau(avctx))
                     ff_vdpau_mpeg_picture_complete(s2, buf, buf_size, s->slice_count);
 
                 if (slice_end(avctx, picture)) {