Fix test "NUL byte in text decrypt" for --without-zlib builds.

Noah Misch <noah@leadboat.com>

Commit: c5dc75479b1525a3aa1daaf79028fa5af159800e
Author: Noah Misch <noah@leadboat.com>
Date: 2026-02-09T17:08:10Z
Fix test "NUL byte in text decrypt" for --without-zlib builds.

Backpatch-through: 14
Security: CVE-2026-2006

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