Prevent sanity check running on jruby due to warning outside of our control

Author: JonRowe

spec/sanity_check_spec.rb

@@ -34,7 +34,7 @@ def with_clean_env
     end
   end
 
-  it "passes when libraries are required" do
+  it "passes when libraries are required", unless: RSpec::Support::Ruby.jruby? do
     script = tmp_root.join("pass_sanity_check")
     File.open(script, "w") do |f|
       f.write <<-EOF.gsub(/^\s+\|/, '')