windows: use //go:uintptrescapes comment
windows: use //go:uintptrescapes comment

CL 24551 introduced //go:uintptrescapes comment to make
syscall.Proc.Call and syscall.LazyProc.Call parameters escape.
Use new comment in this package too.

Updates golang/go#16035.

Change-Id: I57ec3b4778195ca4a1ce9a8eec331f0f69285926
Reviewed-on: https://go-review.googlesource.com/24870
Reviewed-by: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>
Run-TryBot: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>

golang/sys,multiplay/golang-sys,multiplay/golang-sys,multiplay/golang-sys,multiplay/golang-sys,golang/sys,golang/sys