Address review comments

Author: JaceCear

src/core.c

@@ -36,9 +36,11 @@ struct BlendRegs gBldRegs ALIGNED(8) = {};
 u8 gOamFreeIndex = 0;
 struct Task gEmptyTask ALIGNED(16) = {};
 
+#if (ENGINE >= ENGINE_3)
 // NOTE: gNextFreeAffineIndex introduced in SA3, unused before.
 u8 gNextFreeAffineIndex = 0;
-BgAffineReg gBgAffineRegs[NUM_AFFINE_BACKGROUNDS] = {};
+#endif
+BgAffineReg gBgAffineRegs[NUM_AFFINE_BACKGROUNDS] ALIGNED(8) = {};
 void *gVramHeapStartAddr = NULL;
 u16 gUnknown_03001944 ALIGNED(4) = 0;
 u8 gUnknown_03001948 ALIGNED(4) = 0;

src/multi_sio.c

@@ -1,5 +1,4 @@
 #include "global.h"
-#include "game/game.h"
 #include "multi_sio.h"
 #include "sio32_multi_load.h"