Man pages matching name selinux_binary_policy_path in section 3:

selinux_binary_policy_path.3.en	debian 10 / libselinux1-dev
selinux_binary_policy_path.3.en	debian 11 / libselinux1-dev
selinux_binary_policy_path.3.en	debian 12 / libselinux1-dev