structtest: fix imports

Author: tmc

testdata/structtest/struct_test.c

@@ -2,6 +2,8 @@
 // SPDX-FileCopyrightText: 2024 The Ebitengine Authors
 
 #include "stdint.h"
+#include <stdio.h>
+#include <stdlib.h>
 
 #if defined(__x86_64__) || defined(__aarch64__)
 typedef int64_t GoInt;
@@ -369,9 +371,6 @@ struct FourInt32s {
     int32_t f3;
 };
 
-#include <stdio.h>
-#include <stdlib.h>
-
 char* FourInt32s(struct FourInt32s s) {
     char* result = malloc(64);
     snprintf(result, 64, "%d:%d:%d:%d", s.f0, s.f1, s.f2, s.f3);