Only fails_with compiler version for developers.

Actually works properly now.

This reverts commit a0e56345ea55f7ee3c41d6bf13f9cfb3af635323.

Library/Homebrew/compilers.rb

@@ -101,7 +101,7 @@ class CompilerSelector
     @compilers = @compilers.reject do |cc|
       failure = @f.fails_with? cc
       next unless failure
-      failure.build >= cc.build
+      failure.build >= cc.build or not ARGV.homebrew_developer?
     end
 
     return if @compilers.empty? or @compilers.include? ENV.compiler

Library/Homebrew/formula.rb

@@ -202,7 +202,8 @@ class Formula
     cc = Compiler.new(cc) unless cc.is_a? Compiler
     return self.class.cc_failures.find do |failure|
       next unless failure.compiler == cc.name
-      failure.build.zero? or failure.build >= cc.build
+      failure.build.zero? or \
+        (failure.build >= cc.build or not ARGV.homebrew_developer?)
     end
   end