Exposes sys.Stat_t as a portable alternative to syscall.Stat_t (#1567)

Signed-off-by: Adrian Cole <adrian@tetrate.io>

sys/stat_windows.go

@@ -0,0 +1,26 @@
+//go:build (amd64 || arm64) && windows
+
+package sys
+
+import (
+	"io/fs"
+	"syscall"
+)
+
+const sysParseable = true
+
+func statFromFileInfo(info fs.FileInfo) Stat_t {
+	if d, ok := info.Sys().(*syscall.Win32FileAttributeData); ok {
+		st := Stat_t{}
+		st.Ino = 0 // not in Win32FileAttributeData
+		st.Dev = 0 // not in Win32FileAttributeData
+		st.Mode = info.Mode()
+		st.Nlink = 1 // not in Win32FileAttributeData
+		st.Size = info.Size()
+		st.Atim = d.LastAccessTime.Nanoseconds()
+		st.Mtim = d.LastWriteTime.Nanoseconds()
+		st.Ctim = d.CreationTime.Nanoseconds()
+		return st
+	}
+	return defaultStatFromFileInfo(info)
+}