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Re-add the missing headers for EFI_LEGACY_BIOS_PROTOCOL and gEfiLegacyBiosGuid which were removed from OvmfPkg in https://github.com/tianocore/edk2/commit/9d4becddbad24ca00b01d68087e0e86d33ec92b6.
Neither OVMF nor EfiGuard actually *needs* the CSM for anything, but being able to check for the presence of the legacy BIOS protocol is still important in order to determine if we are actually booting a legacy BIOS boot option. This allows us to then inform the user that what they are doing is not suppported and most likely a mistake.
Fixes #119
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