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3a453266e3
Add a standalone VNC server binary that connects to a running QEMU instance via the D-Bus display interface (org.qemu.Display1, via the bus or directly p2p). This allows serving a VNC display without compiling VNC support directly into the QEMU system emulator, and enables running the VNC server as a separate process with independent lifecycle and privilege domain. Built only when both VNC and D-Bus display support are enabled. If we wanted to have qemu -vnc disabled, and qemu-vnc built, we would need to split CONFIG_VNC. This is left as a future exercise. Current omissions include some QEMU VNC runtime features (better handled via restart), legacy options, and Windows support. Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>