Revert "gettext: remove patch"

This is still a burden on older systems.

Fixes Homebrew#166.

This reverts commit 6599cce.

Library/Formula/gettext.rb

@@ -9,6 +9,15 @@ class Gettext < Formula
   keg_only "OS X provides the BSD gettext library and some software gets confused if both are in the library path."
 
   option :universal
+  option 'with-examples', 'Keep example files'
+
+  def patches
+    unless build.include? 'with-examples'
+      # Use a MacPorts patch to disable building examples at all,
+      # rather than build them and remove them afterwards.
+      {:p0 => ['https://trac.macports.org/export/102008/trunk/dports/devel/gettext/files/patch-gettext-tools-Makefile.in']}
+    end
+  end
 
   def install
     ENV.libxml2