Converts unit testing checks into #ifdef and #ifndef.

As per Mloc's comment in #11917.

baystation12.dme

@@ -11,7 +11,6 @@
 // END_PREFERENCES
 // BEGIN_INCLUDE
 #include "code\_macros.dm"
-#include "code\_unit_testing.dm"
 #include "code\global.dm"
 #include "code\hub.dm"
 #include "code\names.dm"

code/_unit_testing.dm

@@ -1,10 +0,0 @@
-/*
- *
- *   This file is used by Travis to indicate that Unit Tests are to be ran.
- *   Do not add anything but the UNIT_TEST definition here as it will be overwritten by Travis when running tests.
- *
- *
- *   Should you wish to edit set UNIT_TEST to 1 like so:
- *   #define UNIT_TEST 1
- */
-#define UNIT_TEST 0

code/world.dm

@@ -39,7 +39,7 @@ var/global/datum/global_init/init = new ()
 
 
 
-#define RECOMMENDED_VERSION 508
+#define RECOMMENDED_VERSION 509
 /world/New()
 	//logs
 	var/date_string = time2text(world.realtime, "YYYY/MM-Month/DD-Day")
@@ -69,11 +69,11 @@ var/global/datum/global_init/init = new ()
 
 	. = ..()
 
-#if !UNIT_TEST
+#ifndef UNIT_TEST
 
 	sleep_offline = 1
 
-#elseif 
+#else
 
 	log_unit_test("Unit Tests Enabled.  This will destroy the world when testing is complete.")
 	log_unit_test("If you did not intend to enable this please check code/__defines/unit_testing.dm")
@@ -115,10 +115,10 @@ var/global/datum/global_init/init = new ()
 		processScheduler.deferSetupFor(/datum/controller/process/ticker)
 		processScheduler.setup()
 		master_controller.setup()
-#if UNIT_TEST
+#ifdef UNIT_TEST
 		initialize_unit_tests()
 #endif
-		
+
 
 
 	spawn(3000)		//so we aren't adding to the round-start lag