Document two new Xpdf vulnerabilities: CVE-2019-16927 and CVE-2019-9877.
PR: 241066
Security: https://nvd.nist.gov/vuln/detail/CVE-2019-16927
Security: https://nvd.nist.gov/vuln/detail/CVE-2019-9877
Security: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-9877
Security: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-16927