Always define oS to be "FreeBSD $2", no matter whether or not we know the version number given as the argument to ".Os FreeBSD xxx". Output nroff warning when we see a version number that we don't know about.
Always define oS to be "FreeBSD $2", no matter whether or not we
know the version number given as the argument to ".Os FreeBSD xxx".
Output nroff warning when we see a version number that we don't
know about.

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