tiff: fix multiple CVE's

This commit fixes multiple CVE's for library tiff:
CVE-2012-4564
CVE-2013-1960
CVE-2013-1961
CVE-2013-4231
CVE-2013-4232
CVE-2013-4244
CVE-2013-4243

Signed-off-by: Jiri Slachta <slachta@cesnet.cz>