(postproc|swresample)/version: Don't include libavutil/avutil.h

Instead only include libavutil/version.h; including avutil.h is a
remnant from the time in which the version was in it.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

libpostproc/version.h

@@ -26,7 +26,7 @@
  * Libpostproc version macros
  */
 
-#include "libavutil/avutil.h"
+#include "libavutil/version.h"
 
 #define LIBPOSTPROC_VERSION_MAJOR  56
 #define LIBPOSTPROC_VERSION_MINOR   0

libswresample/version.h

@@ -26,7 +26,7 @@
  * Libswresample version macros
  */
 
-#include "libavutil/avutil.h"
+#include "libavutil/version.h"
 
 #define LIBSWRESAMPLE_VERSION_MAJOR   4
 #define LIBSWRESAMPLE_VERSION_MINOR   0