- added support for hybrid EFI disk images based on gptsync.
  * if gptsync is installed an MBR is added to the GPT table
  * this allows to boot plain vmx images via legacy BIOS and EFI
  * this allows to boot oem disk via legacy BIOS and EFI
    The repartition code of an EFI oem will overwrite the MBR
    placed by gptsync. Thus the kiwi initrd tries to re-add the
    information by calling syncGPT. The funtion requires the
    presence of gptsync and sfdisk inside the kiwi initrd.
    Both tools are not part of the kiwi initrd by default
  * this allows to boot oem install media via legacy BIOS and EFI
    oem install media are install ISOs and install sticks
  * please note placing an MBR into the GPT is outside of the
    EFI standard. It might happen that an EFI firmware refuse
    to boot a system which includes a MBR inside the GPT.
    Thus gptsync support should be seen as experimental