Update headers from GNU-EFI.

http://sourceforge.net/p/gnu-efi/
commit 8f5ba0e4fd398d49c0004164d18e50fb6acd36ca
Update x86_64 glue from GNU-EFI.

    GNU EFI has removed Linux macro from relocation code.
    http://sourceforge.net/p/gnu-efi/
    commit 8f5ba0e4fd398d49c0004164d18e50fb6acd36ca