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It seems that the files 'src/x86/ffi.c' and 'src/x86/sysv.S'
are not needed for the X86_64 platform in fficonfig.py.in.

They *should* compile to nothing, anyway, because their
contents is protected by 'ifndef __x86_64__'.

Does removing them from fficonfig.py.in change the
situation, so that only this remains:

    'X86_64': ['src/x86/ffi64.c', 'src/x86/unix64.S'],

I can build _ctypes on an unbuntu amd64 system with this change.