[tz] can struct definitions from localtime.c be moved to private.h ?

[Alois Treindl]

The source file localtime.c includes the definitions for structures used 
in the binary (compiled) zone files.

I am writing code which accesses these compiled zone files. It would be 
most convenient to have the struct definitions moved from localtime.c to 
a header file, e.g. private.h which I can include in other code.

struct ttinfo
struct lsinfo
struct state
struct rule