spice-vdagent does not work with Xspice in Red Hat Enterprise Linux 7

Issue

Customer could not get the vdagent to load with Xspice unless compiling his own spice-vdagent version 0.15 from upstream.

https://fedoraproject.org/wiki/QA:Testcase_Spice_Xspice

Red Hat Enterprise Linux (RHEL) 7
spice-vdagent-0.14.0-7.el7.x86_64
spice-server-0.12.4-5.el7.x86_64

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