Pass the build object into the Tab

Since the Tab is written in the build process, the formula's build
object will have the correct args attached to it already, so we don't
need to reconstruct it.

Library/Homebrew/build.rb

@@ -186,8 +186,7 @@ class Build
           # link against it.
           stdlibs = keg.detect_cxx_stdlibs :skip_executables => true
 
-          Tab.create(f, ENV.compiler, stdlibs.first,
-            Options.coerce(ARGV.options_only)).write
+          Tab.create(f, ENV.compiler, stdlibs.first, f.build).write
         rescue Exception => e
           if ARGV.debug?
             debrew e, f

Library/Homebrew/tab.rb

@@ -10,16 +10,13 @@ require 'utils/json'
 class Tab < OpenStruct
   FILENAME = 'INSTALL_RECEIPT.json'
 
-  def self.create f, compiler, stdlib, args
-    build = f.build.dup
-    build.args = args
-
+  def self.create(formula, compiler, stdlib, build)
     Tab.new :used_options => build.used_options,
             :unused_options => build.unused_options,
-            :tabfile => f.prefix.join(FILENAME),
+            :tabfile => formula.prefix.join(FILENAME),
             :built_as_bottle => !!ARGV.build_bottle?,
             :poured_from_bottle => false,
-            :tapped_from => f.tap,
+            :tapped_from => formula.tap,
             :time => Time.now.to_i,
             :HEAD => Homebrew.git_head,
             :compiler => compiler,