os: on windows RemoveAll removing directories containing read-only files errors with `unlinkat ... Access is denied`, ReOpenFile error handling followup [1.25 backport]

[dmitshur]

This is a follow up for issue #75989, a Go 1.25 backport issue that was fixed in Go 1.25.4.

The fix for that issue in CL 715360 added a ReOpenFile syscall to be used by deleteatFallback. Its error handling wasn't checking for the expected value, which was fixed at tip in CL 717320, and @qmuntal suggests also backporting this to Go 1.25. This doesn't apply to Go 1.24 because the original issue was a 1.25-only regression.

A backport CL 718000 is already created, this is just a tracking issue for it.

CC @qmuntal, @neild, @golang/release.

[gopherbot]

Change https://go.dev/cl/718000 mentions this issue: [release-branch.go1.25] internal/syscall/windows: fix ReOpenFile sentinel error value

[gopherbot]

Closed by merging CL 718000 (commit 433c01e) to release-branch.go1.25.