Updated gimp package fixes security vulnerabilities

An integer overflow flaw and a heap-based buffer overflow were found in the way GIMP loaded certain X Window System (XWD) image dump files. A remote attacker could provide a specially crafted XWD image file that, when processed, would cause the XWD plug-in to crash or, potentially, execute arbitrary code with the privileges of the user running the GIMP (CVE-2013-1913, CVE-2013-1978).