We've previously removed a lot of the really old compatibility code,
and with it went the need to include compat.h in most of the files that
have it.
OpenBSD-Commit-ID: 5af8baa194be00a3092d17598e88a5b29f7ea2b4
auth2-pubkey.c
Put them in a new auth2-pubkeyfile.c to make it easier to refer to them
(e.g. in unit/fuzz tests) without having to refer to everything else
pubkey auth brings in.
ok dtucker@
OpenBSD-Commit-ID: 3fdca2c61ad97dc1b8d4a7346816f83dc4ce2217