libxslt: add patch for CVE-2019-11068
References:
https://nvd.nist.gov/vuln/detail/CVE-2019-11068
https://gitlab.gnome.org/GNOME/libxslt/commit/e03553605b45c88f0b4b2980adfbbb8f6fca2fd6
(cherry picked from commit 84b810f8e3dfc4e5649558c8898d686909905ace)
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