* gnu/packages/patches/spice-CVE-2016-9577.patch, gnu/packages/patches/spice-CVE-2016-9578-1.patch, gnu/packages/patches/spice-CVE-2016-9578-2.patch: New files. * gnu/local.mk (dist_patch_DATA): Register them. * gnu/packages/spice.scm (spice)[source]: Use them.