64-bit zic -s

[Robbin Kawabata]

The new 64-bit time zic has the -s flag removed.  Can you give some details
about its removal - do machines that have signed time_t and unsigned time_t 
no longer need to share timezone files?  Is -s no longer needed to pass SVVS?

Also, is there any reason the -s could not be supported by the new 64-bit
zic?  We usually give a 1-year warning before we remove functionality, so
we might add this option back into the 64-bit zic locally (with a note we 
plan to remove it in the next release).  

thanks,
Robbin