Use pkg_version when comparing against keg versions

Library/Homebrew/cmd/cleanup.rb

@@ -59,7 +59,7 @@ module Homebrew
     elsif f.rack.subdirs.length > 1
       # If the cellar only has one version installed, don't complain
       # that we can't tell which one to keep.
-      opoo "Skipping #{f.name}: most recent version #{f.version} not installed"
+      opoo "Skipping #{f.name}: most recent version #{f.pkg_version} not installed"
     end
   end
 

Library/Homebrew/cmd/outdated.rb

@@ -23,7 +23,7 @@ module Homebrew
         keg = Keg.new dir
         version = keg.version
         all_versions << version
-        older_version = f.version <= version
+        older_version = f.pkg_version <= version
 
         tap = Tab.for_keg(keg).tap
         if tap.nil? || f.tap == tap || older_version