Patch from From Alexander Krivenyshev (2008-09-05), and possibly From Paul Eggert (2007-12-22), are inaccurate. Change from Dec 2007 wasn´t supposed to be permanent. Patch attached.
Created attachment 2984 [details] tzdata patch for Argentina since 2008
The time zone data is glibc is not meant to be used. It is just included for testing. Every reasonable distributor has long since issued a separate package. Bother those people. The glibc tzdata content will be updated once there is an update upstream.