lavc/hevcdec: add ONLY_IF_THREADS_ENABLED where it is missing.

add ONLY_IF_THREADS_ENABLED where it is missing.
Signed-off-by: Jun Zhao <mypopydev@gmail.com>
Reviewed-by: James Almer <jamrial@gmail.com>

libavcodec/hevcdec.c

@@ -3358,6 +3358,7 @@ fail:
     return AVERROR(ENOMEM);
 }
 
+#if HAVE_THREADS
 static int hevc_update_thread_context(AVCodecContext *dst,
                                       const AVCodecContext *src)
 {
@@ -3439,6 +3440,7 @@ static int hevc_update_thread_context(AVCodecContext *dst,
 
     return 0;
 }
+#endif
 
 static av_cold int hevc_decode_init(AVCodecContext *avctx)
 {
@@ -3478,6 +3480,7 @@ static av_cold int hevc_decode_init(AVCodecContext *avctx)
     return 0;
 }
 
+#if HAVE_THREADS
 static av_cold int hevc_init_thread_copy(AVCodecContext *avctx)
 {
     HEVCContext *s = avctx->priv_data;
@@ -3491,6 +3494,7 @@ static av_cold int hevc_init_thread_copy(AVCodecContext *avctx)
 
     return 0;
 }
+#endif
 
 static void hevc_decode_flush(AVCodecContext *avctx)
 {
@@ -3529,8 +3533,8 @@ AVCodec ff_hevc_decoder = {
     .close                 = hevc_decode_free,
     .decode                = hevc_decode_frame,
     .flush                 = hevc_decode_flush,
-    .update_thread_context = hevc_update_thread_context,
-    .init_thread_copy      = hevc_init_thread_copy,
+    .update_thread_context = ONLY_IF_THREADS_ENABLED(hevc_update_thread_context),
+    .init_thread_copy      = ONLY_IF_THREADS_ENABLED(hevc_init_thread_copy),
     .capabilities          = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY |
                              AV_CODEC_CAP_SLICE_THREADS | AV_CODEC_CAP_FRAME_THREADS,
     .caps_internal         = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_EXPORTS_CROPPING,