Use unicode escape

Prevents this character from being changed when resaving this file
with TextMate (1) on Snow Leopard.

Closes Homebrew/homebrew#20715.

Library/Homebrew/formula_installer.rb

@@ -264,7 +264,7 @@ class FormulaInstaller
 
     ohai "Summary" if ARGV.verbose? or show_summary_heading
     unless ENV['HOMEBREW_NO_EMOJI']
-      print "🍺  " if MacOS.version >= :lion
+      print "\xf0\x9f\x8d\xba  " if MacOS.version >= :lion
     end
     print "#{f.prefix}: #{f.prefix.abv}"
     print ", built in #{pretty_duration build_time}" if build_time