Add support for the _POSIX_CPUTIME and _POSIX_THREAD_CPUTIME options,

including CLOCK_{PROCESS,THREAD}_CPUTIME_ID constants and
{clock,pthread}_getcpuclockid() functions.
Worked out at t2k13 with help from tedu@ and matthew@ and testing by aja@
ok matthew@

src/include/time.h

@@ -1,4 +1,4 @@
-/*	$OpenBSD: time.h,v 1.24 2013/04/02 05:16:14 guenther Exp $	*/
+/*	$OpenBSD: time.h,v 1.25 2013/06/17 19:11:54 guenther Exp $	*/
 /*	$NetBSD: time.h,v 1.9 1994/10/26 00:56:35 cgd Exp $	*/
 
 /*
@@ -101,6 +101,13 @@ typedef	__timer_t	timer_t;
 #endif
 #endif
 
+#if __POSIX_VISIBLE >= 200112
+#ifndef	_PID_T_DEFINED_
+#define	_PID_T_DEFINED_
+typedef	__pid_t		pid_t;
+#endif
+#endif
+
 struct tm {
 	int	tm_sec;		/* seconds after the minute [0-60] */
 	int	tm_min;		/* minutes after the hour [0-59] */
@@ -154,6 +161,10 @@ int clock_settime(clockid_t, const struct timespec *);
 int nanosleep(const struct timespec *, struct timespec *);
 #endif
 
+#if __POSIX_VISIBLE >= 200112
+int clock_getcpuclockid(pid_t, clockid_t *);
+#endif
+
 #if __BSD_VISIBLE
 char *timezone(int, int);
 void tzsetwall(void);

src/include/unistd.h

@@ -1,4 +1,4 @@
-/*	$OpenBSD: unistd.h,v 1.78 2013/06/04 23:01:07 brad Exp $ */
+/*	$OpenBSD: unistd.h,v 1.79 2013/06/17 19:11:54 guenther Exp $ */
 /*	$NetBSD: unistd.h,v 1.26.4.1 1996/05/28 02:31:51 mrg Exp $	*/
 
 /*-
@@ -66,7 +66,7 @@
 #define _POSIX_BARRIERS				200112L
 #define _POSIX_CHOWN_RESTRICTED			1
 #define _POSIX_CLOCK_SELECTION			(-1)
-#define _POSIX_CPUTIME				(-1)
+#define _POSIX_CPUTIME				200809L
 #define _POSIX_FSYNC				200112L
 #define _POSIX_IPV6				0
 #define _POSIX_JOB_CONTROL			1
@@ -93,7 +93,7 @@
 #define _POSIX_SYNCHRONIZED_IO			(-1)
 #define _POSIX_THREAD_ATTR_STACKADDR		200112L
 #define _POSIX_THREAD_ATTR_STACKSIZE		200112L
-#define _POSIX_THREAD_CPUTIME			(-1)
+#define _POSIX_THREAD_CPUTIME			200809L
 #define _POSIX_THREAD_PRIO_INHERIT		(-1)
 #define _POSIX_THREAD_PRIO_PROTECT		(-1)
 #define _POSIX_THREAD_PRIORITY_SCHEDULING	(-1)