strptime: apply upstream changes to flb_strptime(). (#2431)
strptime: apply upstream changes to flb_strptime(). (#2431)

This incorporates recent changes from OpenBSD project. The current
latest HEAD of strptime(3) in upstream is rev 1.30.

https://cvsweb.openbsd.org/src/lib/libc/time/strptime.c?rev=1.30

Signed-off-by: Fujimoto Seiji <ef879192bb1e41d519c82cf76440dc8e9a530806@ceptord.net>
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