Wait a specific number of second and nanoseconds

Returns true if interrupted by a signal.

Property definitions

core :: time $ Sys :: nanosleep
	# Wait a specific number of second and nanoseconds
	#
	# Returns `true` if interrupted by a signal.
	fun nanosleep(sec, nanosec: Int): Bool `{
		const struct timespec req = {sec, nanosec};
		return nanosleep(&req, NULL);
	`}
lib/core/time.nit:45,2--51,3