Hello again. I found another bug with cyrillic usernames in zsh (again on
Cygwin, but can be reproduced on Linux)

Tested on latest master:

1. Create user "Студент" (for example, via /etc/passwd editing)
2. Create /var/run/utmp file if it is missing (may be necessary on Cygwin)
3. Login into "Студент" (via login or ssh)
4. % zsh-5.9.0.1-dev -f

% whoami
    Студент

% watch=(all); log # (everything is ok)
    root has logged on /proc/10045/fd/2 from .
    Студент has logged on pts/29 from 127.0.0.1.

% watch=(notme); log # ("Студент" record is not filtered)
    root has logged on /proc/10045/fd/2 from .
    Студент has logged on pts/29 from 127.0.0.1.

% watch=(Студент); log # ("Студент" record is missing)

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