Debian LTS: DLA-983-1: tiff3 security update

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tiff3 was affected by multiple memory leaks (CVE-2017-9403, CVE-2017-9404) that could result in denial of service. Furthermore, while the current version in Debian was already patched for _TIFFVGetField issues (CVE-2016-10095, CVE-2017-9147), we replaced our Debian-specific patches