The build failed: checkmodule rejected `policy_module(chrony_dhcp_dispatcher,
1.0.0)` with "Building a policy module, but no module specification found".
policy_module() is a refpolicy m4 macro expanded only by the refpolicy Makefile
(/usr/share/selinux/devel), not by checkmodule. Use the raw module-policy
declaration `module chrony_dhcp_dispatcher 1.0.0;`, which is exactly what
checkmodule -M -m parses. require{} + allow rule unchanged.