Fix missing type declaration compile error

rBbd3bd776c893 broke compilation here due to missing type declaration
for basic types as the source file is not including this header. In any
case, it is the responsibility of header files to include headers for
types used by value in function parameters or struct definitions.

source/blender/blenkernel/BKE_scene.h

@@ -22,6 +22,8 @@
  * \ingroup bke
  */
 
+#include "BLI_sys_types.h"
+
 #ifdef __cplusplus
 extern "C" {
 #endif