msvcrt: Fixed problem parsing multi-byte characters in _mbspbrk.

[Dan Kegel]

http://en.wiktionary.org/wiki/negato says

Adjective
negato m. (f. negata, m plural negati, f plural negate)
   1. denied, refused
negato m. (f. negata, m plural negati, f plural negate) (per) or (in)
   1. useless, hopeless (at)

Neither that, nor the William Gates pseudonym, are particularly
helpful.  Wine is built on a web of trust, and if we have no
idea who you are -- and if you act like you have something to hide --
we might have to assume that you've purloined Windows source
code, and refuse your patch to protect ourselves.

So, who are you, really?
- Dan