Fixed even more stupid msvc compilation issues

src/game/level_update.h

@@ -5,6 +5,9 @@
 
 #include "types.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
 
 #define TIMER_CONTROL_SHOW  0
 #define TIMER_CONTROL_START 1
@@ -128,4 +131,8 @@ s32 lvl_set_current_level(UNUSED s16 arg0, s32 levelNum);
 s32 lvl_play_the_end_screen_sound(UNUSED s16 arg0, UNUSED s32 arg1);
 void basic_update(UNUSED s16 *arg);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif // LEVEL_UPDATE_H

src/port/Enhancements/game-interactor/GameInteractor.cpp

@@ -2,8 +2,6 @@
 
 #include "game/level_update.h"
 
-extern int16_t sCurrPlayMode;
-
 // Taken from game/level_update.c
 #define PLAY_MODE_NORMAL 0
 #define PLAY_MODE_PAUSED 2

src/port/Game.cpp

@@ -7,9 +7,8 @@ extern "C" {
 #include "audio/external.h"
 #include "game/game_init.h"
 #include "sm64.h"
-}
-
 float gInterpolationStep = 0.0f;
+}
 
 void alloc_pool() {
     static u64 pool[1024 * 1024 * 4];