Included the user-defined header after the definition of AcReal to make it available if needed.

include/astaroth_defines.h

@@ -44,8 +44,6 @@ typedef struct {
 } double3;
 #endif // __CUDACC__
 
-#include "stencil_defines.h"
-
 // Library flags
 #define VERBOSE_PRINTING (1)
 
@@ -68,6 +66,8 @@ typedef struct {
     AcReal3 row[3];
 } AcMatrix;
 
+#include "stencil_defines.h" // User-defined header
+
 // clang-format off
 #define AC_FOR_BUILTIN_INT_PARAM_TYPES(FUNC)\
         FUNC(AC_nx), \