cmd/link: internal linking support for windows/arm64

[qmuntal]

This is a #10373 spin-off and a tracking issue to add support for internal linking to the windows/arm64 port.

I plan to do that myself soon, as my new development machine is a Windows Surface that runs on arm64.

Related to #65284.

[gopherbot]

Change https://go.dev/cl/672155 mentions this issue: cmd/link: simplify PE relocations mapping

[gopherbot]

Change https://go.dev/cl/704295 mentions this issue: cmd/link: internal linking support for windows/arm64