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this is extra tricky because they did not specify the exact kernel. mainline could be any of the kernels tagged as stable that you can build from linus’ git tree. i know that in the past you could run a mainline linux on intel 368 chips but today you probably can not because official support was dropped a while ago.
OpenWRT does not use liblzma or systemd so i think that one is pretty safe. I would also be surprised if Android included OpenSSH server binaries in that way.