devel/kf5-kauth: add fix for CVE-2019-7443
From https://www.kde.org/info/security/advisory-20190209-1.txt :
KDE Project Security Advisory
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Title: kauth: Insecure handling of arguments in helpers
Risk Rating: Medium
CVE: CVE-2019-7443
Versions: KDE Frameworks < 5.55.0
Date: 9 February 2019
Overview
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