It's hard to say but since the XBee module only uses the Tx and Rx, the library could work but I'm not positive and I don't have a XBee device to test it. I know that some users in the community have tested the XBee successfully and also there are some notes in the test report that you might find useful: Intel® Download Center
I found this site as well: XBee Initial Setup · gjmorama/GALILEO Wiki · GitHub. It's a guide about how to setup the XBee using a Galileo board. You might find it interesting too.
About the library, I invite you to test it and share your results with the community.