sub_8113F14; make C code compatible with modern cc1

src/save.c

@@ -614,7 +614,12 @@ u16 CalculateChecksum(void *data, u16 size)
     u32 checksum = 0;
 
     for (i = 0; i < (size / 4); i++)
-        checksum += *((u32 *)data)++;
+    {
+        // checksum += *(u32 *)data++;
+        // For compatibility with modern gcc, these statements were separated.
+        checksum += *(u32 *)data;
+        data += 4;
+    }
 
     return ((checksum >> 16) + checksum);
 }