Add a precompiled header for RELs (#2597)

src/d/actor/d_a_e_dk.cpp

@@ -3,6 +3,8 @@
  * 
 */
 
+#include "d/dolzel_rel.h"
+
 #include "d/actor/d_a_e_dk.h"
 #include "d/actor/d_a_player.h"
 #include "d/d_com_inf_game.h"
@@ -42,8 +44,6 @@ enum E_DK_RES_FILE_ID {
 };
 
 
-UNK_REL_DATA;
-
 static dCcD_SrcSph cc_dk_src = {
     { // mObjInf
         { 0x0, { { 0, 0, { 0 } }, { (s32)0xd8fbbddf, { 3 } }, { { 0x75 } } } }, // mObj