remove 512 version checks

code/modules/atmospherics/environmental/LINDA_turf_tile.dm

@@ -98,11 +98,6 @@
 	var/list/new_overlay_types = tile_graphic()
 	var/list/atmos_overlay_types = src.atmos_overlay_types // Cache for free performance
 
-	#if DM_VERSION >= 513
-	#warning 512 is stable now for sure, remove the old code
-	#endif
-
-	#if DM_VERSION >= 512
 	if (atmos_overlay_types)
 		for(var/overlay in atmos_overlay_types-new_overlay_types) //doesn't remove overlays that would only be added
 			vars["vis_contents"] -= overlay
@@ -112,17 +107,6 @@
 			vars["vis_contents"] += new_overlay_types - atmos_overlay_types //don't add overlays that already exist
 		else
 			vars["vis_contents"] += new_overlay_types
-	#else
-	if (atmos_overlay_types)
-		for(var/overlay in atmos_overlay_types-new_overlay_types) //doesn't remove overlays that would only be added
-			cut_overlay(overlay)
-
-	if (new_overlay_types.len)
-		if (atmos_overlay_types)
-			add_overlay(new_overlay_types - atmos_overlay_types) //don't add overlays that already exist
-		else
-			add_overlay(new_overlay_types)
-	#endif
 
 	UNSETEMPTY(new_overlay_types)
 	src.atmos_overlay_types = new_overlay_types

code/modules/client/client_procs.dm

@@ -243,7 +243,7 @@ GLOBAL_LIST_EMPTY(external_rsc_urls)
 
 
 	. = ..()	//calls mob.Login()
-	#if DM_VERSION >= 512
+
 	if (byond_version >= 512)
 		if (!byond_build || byond_build < 1386)
 			message_admins("<span class='adminnotice'>[key_name(src)] has been detected as spoofing their byond version. Connection rejected.</span>")
@@ -261,7 +261,7 @@ GLOBAL_LIST_EMPTY(external_rsc_urls)
 			else
 				qdel(src)
 				return
-	#endif
+
 	if(SSinput.initialized)
 		set_macros()
 

code/modules/reagents/chemistry/machinery/chem_master.dm

@@ -382,15 +382,7 @@
 	else
 		var/md5 = md5(AM.name)
 		for (var/i in 1 to 32)
-			#if DM_VERSION >= 513
-			#warning 512 is definitely stable now, remove the old code
-			#endif
-
-			#if DM_VERSION >= 512
 			. += hex2num(md5[i])
-			#else
-			. += hex2num(copytext(md5,i,i+1))
-			#endif
 		. = . % 9
 		AM.pixel_x = ((.%3)*6)
 		AM.pixel_y = -8 + (round( . / 3)*8)