reinstate bintime

Reference: /n/atom/patch/applied/bintime
Date: Fri Feb 21 16:47:36 CET 2014
Signed-off-by: quanstro@quanstro.net

--- /sys/include/libc.h	Fri Feb 21 16:47:30 2014
+++ /sys/include/libc.h	Fri Feb 21 16:47:31 2014
@@ -336,6 +336,7 @@
 extern	long	times(long*);
 extern	long	tm2sec(Tm*);
 extern	vlong	nsec(void);
+extern	int	bintime(int, vlong*, vlong*, vlong*);
 
 extern	void	cycles(uvlong*);	/* 64-bit value of the cycle counter if there is one, 0 if there isn't */