exceptions: instruct not to file boneyard issues.

Library/Homebrew/exceptions.rb

@@ -153,9 +153,15 @@ class BuildError < RuntimeError
       puts
       puts "#{Tty.red}READ THIS#{Tty.reset}: #{Tty.em}#{OS::ISSUES_URL}#{Tty.reset}"
       if formula.tap?
+        case formula.tap
+        when "homebrew/homebrew-boneyard"
+          puts "#{formula} was moved to homebrew-boneyard because it has unfixable issues."
+          puts "Please do not file any issues about this. Sorry!"
+        else
           puts "If reporting this issue please do so at (not Homebrew/homebrew):"
           puts "  https://github.com/#{formula.tap}/issues"
         end
+      end
     else
       require 'cmd/config'
       require 'cmd/--env'