lesspipe: use new dsl

Formula/lesspipe.rb

@@ -5,12 +5,10 @@ class Lesspipe < Formula
   url 'http://www-zeuthen.desy.de/~friebel/unix/less/lesspipe-1.72.tar.gz'
   md5 '0fdb9d4ab5dd570806e778b6815ea276'
 
-  def options
-    [['--syntax-highlighting', 'Enable syntax highlighting']]
-  end
+  option 'syntax-highlighting', 'Enable syntax highlighting'
 
   def install
-    if ARGV.include? '--syntax-highlighting'
+    if build.include? 'syntax-highlighting'
       inreplace 'configure', %q{$ifsyntax = "\L$ifsyntax";}, %q{$ifsyntax = "\Ly";}
     end