util.paths: Add function for joining path segments

util/paths.lua

@@ -1,3 +1,5 @@
+local t_concat = table.concat;
+
 local path_sep = package.config:sub(1,1);
 
 local path_util = {}
@@ -35,4 +37,8 @@ function path_util.glob_to_pattern(glob)
 	end).."$";
 end
 
+function path_util.join(...)
+	return t_concat({...}, path_sep);
+end
+
 return path_util;