sharing: Enable settings widget for gnome-remote-desktop
Enable support for manipulating GNOME Remote Desktop settings. Settings are done via the org.gnome.desktop.remote-desktop.vnc schema. Configuring the VNC password is done via libsecret, thus libsecret is added as a dependency.
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For this to work you need the master branch of gnome-remote-desktop. It'll gracefully handle the case where it's not available by hiding the UI.