Egyptian time broken

I started writing an Olson timezone querying program (to replace
DT:TZ:Catalog), and discovered that DT:TZ:Tzfile declares that the
current offset in the Africa/Cairo zone is unknown.  This is due to a
problem in the tzfile itself, caused by a bug in zic.  It only shows up
in careful use of the 64-bit version of the file, which is exactly what
DT:TZ:Tzfile does.  I'm treating this as a showstopper for replacing
DT:TZ.  I've reported the problem to the Olson folks.

-zefram