Reimplement clock(3) and switch to OpenBSD time(3).

The new implementation is a better approximation to the processor time used
by the process because it's actually based on resource usage rather than just
elapsed wall clock time.

Change-Id: I9e13b69c1d3048cadf0eb9dec1e3ebc78225596a
diff --git a/libc/include/sys/times.h b/libc/include/sys/times.h
index 1b9b8b2..6ce5b55 100644
--- a/libc/include/sys/times.h
+++ b/libc/include/sys/times.h
@@ -25,6 +25,7 @@
  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  */
+
 #ifndef _SYS_TIMES_H_
 #define _SYS_TIMES_H_
 
@@ -34,7 +35,7 @@
 
 __BEGIN_DECLS
 
-extern clock_t times(struct tms *);
+extern clock_t times(struct tms*);
 
 __END_DECLS