library.dynam.unload

The survival package has a firstlib.R file that I had forgotton and just reviewed.  After 
deleting several bits which had a use 10 years ago during my Splus to R transition, the 
only thing remaining is

.onUnload <- function(libpath)
     library.dynam.unload("survival", libpath)

Does this bit of code still serve a purpose?  Can I toss it?

Terry T.