Prefer Dir.glob when iterating over the result

Library/Homebrew/cmd/tap.rb

@@ -71,7 +71,7 @@ module Homebrew extend self
   def repair_taps
     count = 0
     # prune dead symlinks in Formula
-    Dir["#{HOMEBREW_LIBRARY}/Formula/*.rb"].each do |fn|
+    Dir.glob("#{HOMEBREW_LIBRARY}/Formula/*.rb") do |fn|
       if not File.exist? fn
         File.delete fn
         count += 1

Library/Homebrew/cmd/update.rb

@@ -96,7 +96,7 @@ module Homebrew extend self
 
   def rename_taps_dir_if_necessary
     need_repair_taps = false
-    Dir["#{HOMEBREW_LIBRARY}/Taps/*/"].each do |tapd|
+    Dir.glob("#{HOMEBREW_LIBRARY}/Taps/*/") do |tapd|
       begin
         tapd_basename = File.basename(tapd)