Doesn't build yet:
    In file included from /git/qemu-kvm/hw/ppc440.c:23: ../kvm.h:35: error:
        conflicting types for ‘kvm_init’ ../libkvm-all.h:180: note:
        previous declaration of ‘kvm_init’ was here
    0.10.50-7.kvm87
    - Update to kvm-87
    - Drop upstreamed patches
    - Re-enable preadv()/pwritev() since #497429 is long since fixed