Extension to tzcode to support additional timezones

[Garrett Wollman]

<<On Tue, 26 Oct 2010 13:44:20 -0400, christos at zoulas.com (Christos Zoulas) said:

> I just have:

> typedef struct __state *timezone_t;

Please don't.  C does not have opaque typedefs, only opaque
structures.

-GAWollman