Update vis(3) the latest from NetBSD.

This adds VIS_DQ for compatiblity with OpenBSD.

Correct by an off-by-one error and a read buffer overflow detected using
asan.

MFC after: 1 day

Update to the latest (un)vis(3) sources from NetBSD. This adds
multibyte support[0] and the new functions strenvisx and strsenvisx.

Add MLINKS for vis(3) functions add by this and the initial impor

Update to the latest (un)vis(3) sources from NetBSD. This adds
multibyte support[0] and the new functions strenvisx and strsenvisx.

Add MLINKS for vis(3) functions add by this and the initial import from
NetBSD[1].

PR: bin/166364, bin/175418
Submitted by: "J.R. Oldroyd" <[email protected]>[0]
stefanf[1]
Obtained from: NetBSD
MFC after: 2 weeks

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Replace our implementation of the vis(3) and unvis(3) APIs with
NetBSD's. This output size limited versions of vis and unvis functions
as well as a set of vis variants that allow arbitrary character

Replace our implementation of the vis(3) and unvis(3) APIs with
NetBSD's. This output size limited versions of vis and unvis functions
as well as a set of vis variants that allow arbitrary characters to be
specified for encoding.

Finally, MIME Quoted-Printable encoding as described in RFC 2045 is
supported.

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