Move some vars to C

src/load_save.c

@@ -8,13 +8,12 @@
 #include "pokemon_storage_system.h"
 #include "random.h"
 #include "save_location.h"
+#include "trainer_hill.h"
 #include "gba/flash_internal.h"
 #include "decoration_inventory.h"
 
 static void ApplyNewEncryptionKeyToAllEncryptedData(u32 encryptionKey);
 
-extern void* gUnknown_0203CF5C;
-
 extern bool16 IdentifyFlash(void);
 extern void ApplyNewEncryptionKeyToBerryPowder(u32 key);