git: libc/vis: Use thread-safe mbrtoc() and wcrtomb().

[Sascha Wildner]

commit daf90b11430b53e3139c2fabf012ff3e4b58be87
Author: Sascha Wildner <saw at online.de>
Date:   Fri Nov 2 17:26:59 2018 +0100

    libc/vis: Use thread-safe mbrtoc() and wcrtomb().
    
    Taken-from: FreeBSD

Summary of changes:
 lib/libc/gen/vis.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/daf90b11430b53e3139c2fabf012ff3e4b58be87


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