Use precompiled headers, fix weak data issues

src/d/actor/d_a_demo_item.cpp

@@ -3,6 +3,7 @@
  * Item - Cutscene Item
  */
 
+#include "d/dolzel.h" // IWYU pragma: keep
 #include "d/actor/d_a_demo_item.h"
 #include "d/d_procname.h"
 #include "d/d_priority.h"
@@ -15,8 +16,6 @@
 #include "m_Do/m_Do_mtx.h"
 #include "f_op/f_op_camera.h"
 
-#include "weak_bss_936_to_1036.h" // IWYU pragma: keep
-
 const int daDitem_c::m_rot_time = 8*30;
 
 u8 daDitem_c::m_effect_type[0x100] = {