SECURITY UPDATE: The SSI printenv command in Apache Tomcat 9.0.0.M1
to 9.0.0.17, 8.5.0 to 8.5.39 and 7.0.0 to 7.0.93 echoes user provided
data without escaping and is, therefore, vulnerable to XSS.
debian/patches/CVE-2019-0221.patch: Escape debug output to aid
readability