according to commit 60b412dd, kvm_stat script no longer exists in qemu source tree. I suggest that python_doscript "${S}/scripts/kvm/kvm_stat" should be removed from the ebuild.
thanks for the heads up. fixed here: https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=a358e6ed52668ab63e2db2ad0e3a6215c6493d7c