[MIRROR] Clean up all sorts of crap, mostly defines (#5788)

* Clean up all sorts of crap, mostly defines

* fixes compile errors

code/modules/admin/admin_ranks.dm

@@ -42,9 +42,6 @@ GLOBAL_PROTECT(admin_ranks)
 /datum/admin_rank/vv_edit_var(var_name, var_value)
 	return FALSE
 
-#if DM_VERSION > 512
-#error remove the rejuv keyword from this proc
-#endif
 /proc/admin_keyword_to_flag(word, previous_rights=0)
 	var/flag = 0
 	switch(ckey(word))
@@ -80,9 +77,6 @@ GLOBAL_PROTECT(admin_ranks)
 			flag = R_AUTOLOGIN
 		if("@","prev")
 			flag = previous_rights
-		if("rejuv","rejuvinate")
-			stack_trace("Legacy keyword rejuvinate used defaulting to R_ADMIN")
-			flag = R_ADMIN
 	return flag
 
 /proc/admin_keyword_to_path(word) //use this with verb keywords eg +/client/proc/blah