Use thread-safe strftime_l() instead of strftime().

Use thread-safe strftime_l() instead of strftime().

This removes some setlocale() calls and a lot of commentary about how
dangerous that is.  strftime_l() is from POSIX 2008, and on Windows we
use _wcsftime_l().

While here, adjust error message for strftime_l() failure: it does not
in practice set errno (even though POSIX says it could), so no %m.

Author: Thomas Munro <[email protected]>
Reviewed-by: Heikki Linnakangas <[email protected]>
Reviewed-by: Peter Eisentraut <[email protected]>
Discussion: https://postgr.es/m/CA%2BhUKGJqVe0%2BPv9dvC9dSums_PXxGo9SWcxYAMBguWJUGbWz-A%40mail.gmail.com