or PASSWD_BYUID(), otherwise state.maptype won't be correct and the wrong
map may be selected (e.g., "passwd.by*" instead of "master.passwd.by*").
Set _PASSWORD_NOWARN in flags to __pw_scan(), so libc won't display parse
errors to stderr. (This was the behaviour before my recent rototill.)
Fixes PR 27168 from Markus W Kilbinger.
dd9512e81e