[release-branch.go1.12] runtime: ignore power notification error seen on Windows Docker

Updates #36557
Fixes #36574

Change-Id: Ia8125f382d5e14e5612da811268a58971cc9ac08
Reviewed-on: https://go-review.googlesource.com/c/go/+/214917


Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Jason A. Donenfeld <Jason@zx2c4.com>
Reviewed-by: Austin Clements <austin@google.com>
(cherry picked from commit d2de9bd5)
Reviewed-on: https://go-review.googlesource.com/c/go/+/215017