Move Tab creation into build process

The parent process doesn't have access to the selected compiler, which
will be important in the next commit.

Fortunately the child process already has a filtered and massaged
ARGV, so it has enough information to build the tab itself.

Library/Homebrew/build.rb

@@ -170,6 +170,7 @@ class Build
 
         begin
           f.install
+          Tab.create(f, Options.coerce(ARGV.options_only)).write
         rescue Exception => e
           if ARGV.debug?
             debrew e, f

Library/Homebrew/formula_installer.rb

@@ -355,8 +355,6 @@ class FormulaInstaller
 
     raise "Empty installation" if Dir["#{f.prefix}/*"].empty?
 
-    Tab.create(f, build_argv).write # INSTALL_RECEIPT.json
-
   rescue Exception
     ignore_interrupts do
       # any exceptions must leave us with nothing installed