gnu: icecat: Apply fixes for CVE-2015-{0797,2708,2710,2713,2716}.
* gnu/packages/patches/icecat-CVE-2015-0797.patch,
gnu/packages/patches/icecat-CVE-2015-2708-pt1.patch,
gnu/packages/patches/icecat-CVE-2015-2708-pt2.patch,
gnu/packages/patches/icecat-CVE-2015-2708-pt3.patch,
gnu/packages/patches/icecat-CVE-2015-2708-pt4.patch,
gnu/packages/patches/icecat-CVE-2015-2710-pt1.patch,
gnu/packages/patches/icecat-CVE-2015-2710-pt2.patch,
gnu/packages/patches/icecat-CVE-2015-2710-pt3.patch,
gnu/packages/patches/icecat-CVE-2015-2713-pt1.patch,
gnu/packages/patches/icecat-CVE-2015-2713-pt2.patch,
gnu/packages/patches/icecat-CVE-2015-2716.patch: New files.
* gnu-system.am (dist_patch_DATA): Add them.
* gnu/packages/gnuzilla.scm (icecat): Add patches.