lists/pkglists/hardening: procd-seccomp is not available on arm64
Packages "libseccomp", "scmp_sys_resolver" are available for all of routers in OpenWrt 19.07 and OpenWrt master. Below are links for master, but packages are there also for OpenWrt 19.07, verified.
MOX:
There is no package procd-seccomp https://github.com/openwrt/openwrt/blob/master/package/system/procd/Makefile#L61
https://repo.turris.cz/master/mox/packages/packages/libseccomp_2.4.1-1_aarch64_cortex-a53.ipk
https://repo.turris.cz/master/mox/packages/packages/scmp_sys_resolver_2.4.1-1_aarch64_cortex-a53.ipk
Turris 1.x:
https://repo.turris.cz/master/turris1x/packages/base/procd-seccomp_2019-11-04-3aa051b4-4_powerpc_8540.ipk
https://repo.turris.cz/master/turris1x/packages/packages/libseccomp_2.4.1-1_powerpc_8540.ipk
https://repo.turris.cz/master/turris1x/packages/packages/scmp_sys_resolver_2.4.1-1_powerpc_8540.ipk
Turris Omnia:
https://repo.turris.cz/master/omnia/packages/base/procd-seccomp_2019-11-04-3aa051b4-4_arm_cortex-a9_vfpv3.ipk
https://repo.turris.cz/master/omnia/packages/packages/libseccomp_2.4.1-1_arm_cortex-a9_vfpv3.ipk
https://repo.turris.cz/master/omnia/packages/packages/scmp_sys_resolver_2.4.1-1_arm_cortex-a9_vfpv3.ipk
This will be merged to v5.0 (aka OpenWrt 19.07) and master (OpenWrt master).