New maintainers for the x86 architecture

> He simply said that he isn't interested in working on the merged system

Unless I missed something, this is wrong.  Andi is not interested in _maintaining_ the merged
architecture.  Maintenance includes reponsibility and not wanting to be responsible for the
merged architecture is quite understandable, given his numerous objections.

But I would be quite surprise if Andi will stop working on x86_64 completely.  [side note: He
was frequently proclaimed maintainer of i386 as well, but never wanted the job.]