Fix keg method visibility

Only link_dir needs to be protected

Library/Homebrew/keg.rb

@@ -276,7 +276,7 @@ class Keg < Pathname
     find { |pn| pn.delete if pn.extname == ".pyc" }
   end
 
-  protected
+  private
 
   def resolve_any_conflicts dst, mode
     # if it isn't a directory then a severe conflict is about to happen. Let
@@ -330,6 +330,8 @@ class Keg < Pathname
     raise LinkError.new(self, src, dst)
   end
 
+  protected
+
   # symlinks the contents of self+foo recursively into #{HOMEBREW_PREFIX}/foo
   def link_dir foo, mode
     root = self+foo