Bug#1106641: fence-agents ftbfs with libxml 2.14.x from experimental

[Matthias Klose]

Control: tags -1 + patch

libxml2 now has a conflicting macro. that's how I worked around it.

patch at
https://launchpadlibrarian.net/795837407/fence-agents_4.16.0-2ubuntu2_4.16.0-2ubuntu3.diff.gz