Synchronize <sys/_timespec.h> with FreeBSD

newlib/libc/include/sys/_timespec.h

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1982, 1986, 1993
  *	The Regents of the University of California.  All rights reserved.
  *
@@ -10,7 +12,7 @@
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
- * 4. Neither the name of the University nor the names of its contributors
+ * 3. Neither the name of the University nor the names of its contributors
  *    may be used to endorse or promote products derived from this software
  *    without specific prior written permission.
  *
@@ -28,7 +30,7 @@
  *
  *	@(#)time.h	8.5 (Berkeley) 5/4/95
  * from: FreeBSD: src/sys/sys/time.h,v 1.43 2000/03/20 14:09:05 phk Exp
- *	$FreeBSD$
+ *	$FreeBSD: head/sys/sys/_timespec.h 326023 2017-11-20 19:43:44Z pfg $
  */
 
 #ifndef _SYS__TIMESPEC_H_