Make preprocessor condition more specific and useful by changing

#ifdef CONFIG_ENCODERS --> #ifdef CONFIG_DVVIDEO_ENCODER.


git-svn-id: file:///var/local/repositories/ffmpeg/trunk@14165 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavcodec/dv.c

@@ -1000,7 +1000,7 @@ static int dv_decode_mt(AVCodecContext *avctx, void* sl)
     return 0;
 }
 
-#ifdef CONFIG_ENCODERS
+#ifdef CONFIG_DVVIDEO_ENCODER
 static int dv_encode_mt(AVCodecContext *avctx, void* sl)
 {
     DVVideoContext *s = avctx->priv_data;