* Merge with Debian unstable. Dropping the following patches in favour
  of Debian ones:
  - xsa33-4.2-unstable.patch
  - xsa36-4.2.patch
  - xsa44-4.2.patch
  - xsa45-4.2-01-vcpu-destroy-pagetables-preemptible.patch
  - xsa45-4.2-02-new-guest-cr3-preemptible.patch
  - xsa45-4.2-03-new-user-base-preemptible.patch
  - xsa45-4.2-04-vcpu-reset-preemptible.patch
  - xsa45-4.2-05-set-info-guest-preemptible.patch
  - xsa45-4.2-06-unpin-preemptible.patch
  - xsa45-4.2-07-mm-error-paths-preemptible.patch
  - xsa46-4.2.patch
  - xsa47-4.2-unstable.patch
  - xsa49-4.2.patch
* Remaining changes:
  - debian/control: Depend on libssl-dev
  - Use dpkg-buildflags and strip the gcc prefix for getting LDFLAGS.
    This will again use the Ubuntu specific LDFLAGS (using some
    hardening options). Older releases would always pass those options
    in the environment but that changed.
  - Ressurrect qemu-dm for now (upstream qemu would not support
    migration, yet). Forward-port some patches from the old Debian
    package which still included qemu-dm:
    - qemu-prefix (modify LDFLAGS to point to lib dir for qemu-dm)
    - qemu-disable-blktap (this is not present in upstream)
    - ubuntu-qemu-disable-qemu-upstream (breaks build and also should
      be provided by qemu/kvm package)
* Remaining additional patches:
  - qemu-cve-2012-6075-1.patch / qemu-cve-2012-6075-2.patch
  - xsa34-4.2.patch
  - xsa35-4.2-with-xsa34.patch
  - xsa38.patch
  - xsa52-4.2-unstable.patch
  - xsa53-4.2.patch
  - xsa54.patch
  - xsa56.patch
  - qemu-fix-librt-test.patch
    Fix build regression caused by glibc not requiring to link against
    librt for the clock_gettime function. Patch picked from xen-devel
    mailing list.
  - tools-gdbsx-fix-build-failure-with-glibc-2.17.patch
    Add direct include to sys/types.h for xg_main.c which likely was
    indirectly done before. Needed to get ulong type definition.
  - tools-ocaml-fix-build: refresh and reenable (and fix the description
    of) this patch.  Without it the ocam native libraries (*.cmxa)
    build in /build local paths rather than appropriatly versioned
    library references.
  - APIC Register Virtualization (backported from Xen 4.3)
    - 0001-xen-enable-APIC-Register-Virtualization.patch
    - 0002-xen-enable-Virtual-interrupt-delivery.patch
    - 0003-xen-add-virtual-x2apic-support-for-apicv.patch
  - TSC Adjust Support (backported from Xen 4.3)
    - 0004-x86-Implement-TSC-adjust-feature-for-HVM-guest.patch
    - 0005-x86-Save-restore-TSC-adjust-during-HVM-guest-migrati.patch
    - 0006-x86-Expose-TSC-adjust-to-HVM-guest.patch
  - Fix FTBS on i386
    - 0007-x86-Fix-i386-virtual-apic.patch
  - Fix HVM regression when host supports SMEP
    - 0008-vmx-Simplify-cr0-update-handling-by-deferring-cr4-ch.patch
    - 0009-VMX-disable-SMEP-feature-when-guest-is-in-non-paging.patch
    - 0010-VMX-Always-disable-SMEP-when-guest-is-in-non-paging-.patch
  - silence-gcc-warnings.patch: Silence gcc warnings.
  - gcc48-ftbfs.patch
  - gcc48-ftbfs-2.patch