You no longer need a Mac to wrap XenMobile applications.
Citrix have introduced a cloud service (using Citrix Cloud) that provides you with the ability to wrap XenMobile applications.
Link to the cloud service: https://mdx.xm.cloud.com
More details available here: http://arnaudpain.com/index.php/2017/01/25/xenmobile-wrapping-service/
Citrix have also published an article on the official knowledge base, available here: Citrix Developer Portal