avcodec/vaapi_encode: fix compilation without CONFIG_VAAPI_1

This adds VAAPIEncodeContext *ctx that has been removed
in aa82340b0c.

Signed-off-by: Ingo Brückl <ib@oddnet.de>
(cherry picked from commit 5557c673ea)

libavcodec/vaapi_encode_h264.c

@@ -406,6 +406,9 @@ static int vaapi_encode_h264_init_picture_params(AVCodecContext *avctx,
                                                  FFHWBaseEncodePicture *pic)
 {
     FFHWBaseEncodeContext       *base_ctx = avctx->priv_data;
+#if !CONFIG_VAAPI_1
+    VAAPIEncodeContext               *ctx = avctx->priv_data;
+#endif
     VAAPIEncodeH264Context          *priv = avctx->priv_data;
     VAAPIEncodePicture         *vaapi_pic = pic->priv;
     VAAPIEncodeH264Picture          *hpic = pic->codec_priv;