Add cross-compile instructions
Add cross-compile instructions
dongyuzheng/packer-builder-xenserver,xenserverarmy/packer,simonfuhrer/packer-builder-xenserver-1,makunterry/packer-builder-xenserver,fr34k8/packer-builder-xenserver,conceptboard/packer,june07/packer-builder-xenserver,fr34k8/packer-builder-xenserver,simonfuhrer/packer-builder-xenserver-1,june07/packer-builder-xenserver,makunterry/packer-builder-xenserver,conceptboard/packer,rdobson/packer-builder-xenserver,rdobson/packer-builder-xenserver,xenserverarmy/packer,dongyuzheng/packer-builder-xenserver