mlkit: remove requirement

mlton has an install location requirement, and this does not strictly
need to be duplicated in mlkit

Formula/mlkit.rb

@@ -1,24 +1,10 @@
 require 'formula'
 
-class StandardHomebrewLocation < Requirement
-  satisfy HOMEBREW_PREFIX.to_s == "/usr/local"
-
-  def message; <<-EOS.undent
-    mlton won't work outside of /usr/local
-
-    Because this uses pre-compiled binaries, it will not work if
-    Homebrew is installed somewhere other than /usr/local; mlton
-    will be unable to find GMP.
-    EOS
-  end
-end
-
 class Mlkit < Formula
   homepage 'http://sourceforge.net/apps/mediawiki/mlkit'
   url 'http://downloads.sourceforge.net/project/mlkit/mlkit-4.3.7/mlkit-4.3.7.tgz'
   sha1 '7c1f69f0cde271f50776d33b194699b403bab598'
 
-  depends_on StandardHomebrewLocation
   depends_on :autoconf => :build
   depends_on 'mlton' => :build
   depends_on :tex