Use precompiled headers, fix weak data issues

src/d/actor/d_a_obj_pfall.cpp

@@ -3,6 +3,7 @@
  * NPC - Rat (crawlspaces) (opens trap doors)
  */
 
+#include "d/dolzel.h" // IWYU pragma: keep
 #include "d/actor/d_a_obj_pfall.h"
 #include "d/d_procname.h"
 #include "d/d_com_inf_game.h"
@@ -11,9 +12,6 @@
 #include "d/actor/d_a_player_main.h"
 #include "d/d_priority.h"
 
-#include "weak_data_1811.h" // IWYU pragma: keep
-#include "weak_bss_936_to_1036.h" // IWYU pragma: keep
-
 static const int l_bck_ix_tbl[] = {
     PFALL_BCK_NZ_WAIT,
     PFALL_BCK_HIKU,