qemu: only request sound cgroup ACL when required
When a SPICE or VNC graphics controller is present, and sound is piggybacked over a channel to the graphics device rather than directly accessing host hardware, then there is no need to grant host hardware access to that qemu process. * src/qemu/qemu_cgroup.c (qemuSetupCgroup): Prevent sound with spice, and with vnc when vnc_allow_host_audio is 0. Reported by Daniel Berrange.
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