Remove use of %z in sscanf.

Noah Misch <noah@leadboat.com>

Commit: 8866ed9560576de9dec628d5bfdb1571ec8d8ef0
Author: Noah Misch <noah@leadboat.com>
Date: 2024-06-16T19:29:25Z
Releases: 17.0
Remove use of %z in sscanf.

As in 9d7ded0f4277f5c0063eca8e871a34e2355a8371, it causes warnings on
some MinGW compilers.

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