nvi: <tab> can't be used in the context of substitute

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Hi,

It looks like the new nvi version don't accept <tab> in the context of
substitute.  A minimal use case would be to replace all leading 8
spaces with tabs, what one would do on older version of nvi would be:

: 1,$ s/^        /<tab>/g

Now, with nvi in FreeBSD 10.x+, entering <tab> won't yield the <tab>
character.  This seems to be a regression from older nvi version.

Is this a known issue, or did I missed something?

Thanks in advance!

Cheers,
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