remove unnecessary require statements

Library/Homebrew/bottles.rb

@@ -1,5 +1,4 @@
 require "tab"
-require "os/mac"
 require "extend/ARGV"
 
 def built_as_bottle?(f)

Library/Homebrew/extend/ENV/std.rb

@@ -1,5 +1,4 @@
 require "hardware"
-require "os/mac"
 require "extend/ENV/shared"
 
 # @deprecated

Library/Homebrew/extend/ENV/super.rb

@@ -1,4 +1,3 @@
-require "os/mac"
 require "extend/ENV/shared"
 
 # ### Why `superenv`?

Library/Homebrew/utils.rb

@@ -1,6 +1,5 @@
 require "pathname"
 require "exceptions"
-require "os/mac"
 require "utils/json"
 require "utils/inreplace"
 require "utils/popen"