user/spice-gtk: tests may leave dirty environment
Found on ppc64 after builds/tests finished:
1000 477487 0.0 0.0 9984 1920 ? Sl May28 0:00 /root/packages/user/spice-gtk/src/spice-gtk-0.38/output/tests/test-mock-acl-helper
1000 477488 0.0 0.0 9984 1920 ? Sl May28 0:00 /root/packages/user/spice-gtk/src/spice-gtk-0.38/output/tests/test-mock-acl-helper