[Cin] Dual-screen support was working in cinCV at least

[Andrew Randrianasulu]

Managed to get qemu (v7.2.0-334-g959b27f577-dirty) running with  two
virtual displays

qemu-system-x86_64 -enable-kvm -m 2000 -cpu qemu64 -device
virtio-vga,max_outputs=2 -device virtio-vga -cdrom
/home/admin/CDROM-4.14.246-big-7.iso -smp 2 -device usb-mouse -M q35
-usb

then in running system I run xconf (script configuring X from old Slax
6) and then startx bring me two displays.

first i send xterm to second display by using DISPLAY=":0.1"

from there I launchd cinelerra
I typed :0.0 in CinCV's output config tab, and on next startup
Compositor was on original first display..
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