Add Gnome Boxes (access remote or virtual systems)

Also add "libosinfo" which is a dependency of gnome-boxes.

TODO: I'm having an issue with keyboard input; it doesn't seem to reach the VM... Mouse input works.

CC: @lethalman
Note that wrapProgram only wraps one program. Maybe you wanted to do a for f in "$out/bin/"*; do here?
If it's only gnome-boxes better use $out/bin/gnome-boxes.