strptime: copy strptime.c from OpenBSD project
strptime: copy strptime.c from OpenBSD project

This file is copied from lib/libc/time/strptime.c in the following
revision (the license is 2-clause BSD).

https://cvsweb.openbsd.org/src/lib/libc/time/strptime.c?rev=1.24

We will base our work on this implementation.

Signed-off-by: Fujimoto Seiji <ef879192bb1e41d519c82cf76440dc8e9a530806@clear-code.com>

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