windows: add FILE_ZERO_DATA_INFORMATION

This is needed for invoking windows.DeviceIoControl with
windows.FSCTL_SET_ZERO_DATA.

Change-Id: I20f93a40a86b92e6bdeeec096ffc0245e8184672
GitHub-Last-Rev: 01d299a
GitHub-Pull-Request: #261
Reviewed-on: https://go-review.googlesource.com/c/sys/+/698436
Auto-Submit: Michael Pratt <mpratt@google.com>
Reviewed-by: Quim Muntal <quimmuntal@gmail.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>

Author: tomgr

windows/types_windows.go

@@ -1976,6 +1976,12 @@ const (
 	SYMBOLIC_LINK_FLAG_DIRECTORY     = 0x1
 )
 
+// FILE_ZERO_DATA_INFORMATION from winioctl.h
+type FileZeroDataInformation struct {
+	FileOffset      int64
+	BeyondFinalZero int64
+}
+
 const (
 	ComputerNameNetBIOS                   = 0
 	ComputerNameDnsHostname               = 1