gotta replace all of them actually

code/__DEFINES/spaceman_dmm.dm

@@ -29,6 +29,5 @@
 #endif
 
 /world/proc/enable_debugger()
-    var/dll = world.GetConfig("env", "EXTOOLS_DLL")
-    if (dll)
-        call(dll, "debug_initialize")()
+    if (fexists(EXTOOLS))
+        call(EXTOOLS, "debug_initialize")()

code/game/world.dm

@@ -9,9 +9,8 @@ GLOBAL_LIST(topic_status_cache)
 //This happens after the Master subsystem new(s) (it's a global datum)
 //So subsystems globals exist, but are not initialised
 /world/New()
-	var/extools = world.GetConfig("env", "EXTOOLS_DLL") || "./byond-extools.dll"
-	if (fexists(extools))
-		call(extools, "maptick_initialize")()
+	if (fexists(EXTOOLS))
+		call(EXTOOLS, "maptick_initialize")()
 	enable_debugger()
 
 	world.Profile(PROFILE_START)