Init a new Timespec copied from another.

Property definitions

realtime $ Timespec :: copy_of
	# Init a new Timespec copied from another.
	new copy_of( other : Timespec ) `{
		struct timespec* tv = malloc( sizeof(struct timespec) );
		tv->tv_sec = other->tv_sec;
		tv->tv_nsec = other->tv_nsec;
		return tv;
	`}
lib/realtime/realtime.nit:75,2--81,3