test/abi: reenable test on windows

Reverses CL 308889.
Fixes #45465.
Updates #40724.

Change-Id: I34b0d396dc34d0ec8c216e9b6a668de9dfce677c
Reviewed-on: https://go-review.googlesource.com/c/go/+/310649


Trust: David Chase <drchase@google.com>
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>