* gnu/packages/docker.scm (containerd): Update to 1.6.6.
[arguments]: Substitute runc binary for "pkg/cri/config/config_unix.go". Set
PREFIX to empty string, as the install directory is $DESTDIR/$PREFIX.
Co-authored-by: Maxim Cournoyer <maxim.cournoyer@gmail.com>
Signed-off-by: Maxim Cournoyer <maxim.cournoyer@gmail.com>