Remove spork usage in specs, as we're only running them once per
build anyway.

Index: ruby-buff-shell-out-1.1.0/spec/spec_helper.rb
===================================================================
--- ruby-buff-shell-out-1.1.0.orig/spec/spec_helper.rb
+++ ruby-buff-shell-out-1.1.0/spec/spec_helper.rb
@@ -14,7 +14,7 @@
   end
 end
 
-if Buff::RubyEngine.jruby?
+if true
   require 'buff/shell_out'
   setup_rspec
 else
