Fix Pathname#lutime test and add the method back

Author: eregon

lib/pathname.rb

@@ -981,6 +981,13 @@ def truncate(length) File.truncate(@path, length) end
   # See <tt>File.utime</tt>.  Update the access and modification times.
   def utime(atime, mtime) File.utime(atime, mtime, @path) end
 
+  # Update the access and modification times of the file.
+  #
+  # Same as Pathname#utime, but does not follow symbolic links.
+  #
+  # See File.lutime.
+  def lutime(atime, mtime) File.lutime(atime, mtime, @path) end
+
   # See <tt>File.basename</tt>.  Returns the last component of the path.
   def basename(...) self.class.new(File.basename(@path, ...)) end
 

test/pathname/test_pathname.rb

@@ -1054,7 +1054,11 @@ def test_lutime
       latime = Time.utc(2000)
       lmtime = Time.utc(1999)
       File.symlink("a", "l")
-      Pathname("l").utime(latime, lmtime)
+      begin
+        Pathname("l").lutime(latime, lmtime)
+      rescue NotImplementedError
+        next
+      end
       s = File.lstat("a")
       ls = File.lstat("l")
       assert_equal(atime, s.atime)