src/core1: reorganized header files

src/core2/code_34790.c

@@ -1,8 +1,8 @@
 #include <ultra64.h>
+#include "core1/core1.h"
 #include "functions.h"
 #include "variables.h"
 #include "core2/nc/camera.h"
-#include <core1/viewport.h>
 #include "core2/coords.h"
 
 extern Actor *func_80328230(enum actor_e, f32[3], f32[3]);