Final bit of compiling on Windows

Signed-off-by: John Howard <jhoward@microsoft.com>

osutils/windows.go

@@ -1 +1,9 @@
+// +build windows
+
 package osutils
+
+// GetOpenFds returns the number of open fds for the process provided by pid
+// Not supported on Windows (same as for docker daemon)
+func GetOpenFds(pid int) (int, error) {
+	return -1, nil
+}