Revert "Options is no longer used directly by BuildOptions"

This reverts commit 1c05bc0238aa1abf7d5542b8afa11ead2bee66a8.

Library/Homebrew/build_options.rb

@@ -1,3 +1,5 @@
+require 'options'
+
 class BuildOptions
   attr_accessor :universal
 

Library/Homebrew/test/test_build_options.rb

@@ -1,6 +1,5 @@
-require "testing_env"
-require "build_options"
-require "options"
+require 'testing_env'
+require 'build_options'
 
 class BuildOptionsTests < Homebrew::TestCase
   def setup