* gnu/packages/patches/libwmf-CVE-2006-3376.patch, gnu/packages/patches/libwmf-CVE-2009-1364.patch, gnu/packages/patches/libwmf-CVE-2015-0848+4588+4695+4696.patch: New files. * gnu-system.am (dist_patch_DATA): Add them. * gnu/packages/image.scm (libwmf)[source]: Add patches.