Reduce overlay dependencies on global.h (1) (#2438)

* Reduce actor dependencies on global.h

* move dependency on z64play.h into the .c files

* add some missing dependencies

src/code/z_env_flags.c

@@ -1,4 +1,5 @@
-#include "global.h"
+#include "ultra64.h"
+#include "z64play.h"
 
 void CutsceneFlags_UnsetAll(PlayState* play) {
     u8 i;