* gnu/packages/patches/qemu-CVE-2015-8619.patch, gnu/packages/patches/qemu-CVE-2016-1981.patch, gnu/packages/patches/qemu-CVE-2016-2197.patch, gnu/packages/patches/qemu-usb-ehci-oob-read.patch: New files. * gnu-system.am (dist_patch_DATA): Add them. * gnu/packages/qemu.scm (qemu)[source]: Add patches.