Put remaining pieces of CODEC_FLAG_EMU_EDGE under FF_API_EMU_EDGE.

The amv one probably looks suspicious, but since it's an intra-only
codec, I couldn't possibly imagine what it would use the edge for,
and the vsynth fate result doesn't change, so it's probably OK.

ffplay.c

@@ -2577,11 +2577,15 @@ static int stream_component_open(VideoState *is, int stream_index)
     }
     av_codec_set_lowres(avctx, stream_lowres);
 
+#if FF_API_EMU_EDGE
     if(stream_lowres) avctx->flags |= CODEC_FLAG_EMU_EDGE;
+#endif
     if (fast)
         avctx->flags2 |= AV_CODEC_FLAG2_FAST;
+#if FF_API_EMU_EDGE
     if(codec->capabilities & AV_CODEC_CAP_DR1)
         avctx->flags |= CODEC_FLAG_EMU_EDGE;
+#endif
 
     opts = filter_codec_opts(codec_opts, avctx->codec_id, ic, ic->streams[stream_index], codec);
     if (!av_dict_get(opts, "threads", NULL, 0))