fix a compiling error with llvm-gcc

Move some #include in vda.h down to prevent libavutil headers
from interfering with system headers

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/vda.h

@@ -29,12 +29,6 @@
  * Public libavcodec VDA header.
  */
 
-#include "libavcodec/version.h"
-
-#if FF_API_VDA_ASYNC
-#include <pthread.h>
-#endif
-
 #include <stdint.h>
 
 // emmintrin.h is unable to compile with -std=c99 -Werror=missing-prototypes
@@ -45,6 +39,12 @@
 #include <VideoDecodeAcceleration/VDADecoder.h>
 #undef Picture
 
+#include "libavcodec/version.h"
+
+#if FF_API_VDA_ASYNC
+#include <pthread.h>
+#endif
+
 /**
  * @defgroup lavc_codec_hwaccel_vda VDA
  * @ingroup lavc_codec_hwaccel