Call reset in the superclass implementation of setup_build_environment

Library/Homebrew/extend/ENV/shared.rb

@@ -29,6 +29,7 @@ module SharedEnvExtension
 
   def setup_build_environment(formula=nil)
     @formula = formula
+    reset
   end
 
   def reset

Library/Homebrew/extend/ENV/std.rb

@@ -17,7 +17,6 @@ module Stdenv
 
   def setup_build_environment(formula=nil)
     super
-    reset
 
     if MacOS.version >= :mountain_lion
       # Mountain Lion's sed is stricter, and errors out when

Library/Homebrew/extend/ENV/super.rb

@@ -35,7 +35,6 @@ module Superenv
 
   def setup_build_environment(formula=nil)
     super
-    reset
     send(compiler)
 
     self['MAKEFLAGS'] ||= "-j#{determine_make_jobs}"