windows: replace uses of Close() with CloseHandle()

Since https://golang.org/cl/4600042, Close is a straight wrapper of CloseHandle.

Change-Id: I45067e3cc649ea40deb88a8d9d223d7ca882ee7f
GitHub-Last-Rev: 076621a
GitHub-Pull-Request: #139
Reviewed-on: https://go-review.googlesource.com/c/sys/+/441436
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Bryan Mills <bcmills@google.com>

Author: thaJeztah

windows/syscall_windows.go

@@ -755,7 +755,7 @@ func Utimes(path string, tv []Timeval) (err error) {
 	if e != nil {
 		return e
 	}
-	defer Close(h)
+	defer CloseHandle(h)
 	a := NsecToFiletime(tv[0].Nanoseconds())
 	w := NsecToFiletime(tv[1].Nanoseconds())
 	return SetFileTime(h, nil, &a, &w)
@@ -775,7 +775,7 @@ func UtimesNano(path string, ts []Timespec) (err error) {
 	if e != nil {
 		return e
 	}
-	defer Close(h)
+	defer CloseHandle(h)
 	a := NsecToFiletime(TimespecToNsec(ts[0]))
 	w := NsecToFiletime(TimespecToNsec(ts[1]))
 	return SetFileTime(h, nil, &a, &w)