Make freetype php keg_only on all versions of osx

Author: mattheath

files/brews/freetype.rb

@@ -5,7 +5,7 @@ class Freetypephp < Formula
   url 'http://downloads.sf.net/project/freetype/freetype2/2.4.11/freetype-2.4.11.tar.gz'
   sha1 'a8373512281f74a53713904050e0d71c026bf5cf'
 
-  keg_only :provided_pre_mountain_lion
+  keg_only "Sandboxed for PHP installations"
 
   option :universal