Fabian Homborg 8f7a47547e functions/__fish_print_hostnames: Don't run getent hosts twice
`getent hosts` is expensive-ish - ~50ms, so we don't want to run it
twice just to figure out it works.

Apparently this works everywhere but CYGWIN and possibly older
OpenBSD, but we don't want to explicitly blacklist those.

[ci skip]
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