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Rationale for this change:
ipf is already there
if the kernel is configured with a packet filter which drops packets by default, pfctl or ipfw will be required in the rescue environment to make the network functional.
rescue's stated purpose is to be useful for small/embedded systems (and is also quite useful for small jails); a rescue-based router would want these binaries.
On amd64, this increases the size of rescue from 17346200 to 17907248, or 561048 bytes (3.2%).