Uninitialised Values in cs_dt_crack

When running valgrind against a client app linking against ctlib that 
uses cs_dt_crack you get uninitialised value warnings like this:

==32365== Conditional jump or move depends on uninitialised value(s) 
 
 

==32365==    at 0x5538A0A: __offtime (offtime.c:41) 
 
 

==32365==    by 0x553AFA6: __tz_convert (tzset.c:648) 
 
 

==32365==    by 0x4E3C451: cs_dt_crack (cs.c:840)

It looks like there is some old code in there that never got removed.

Thanks for the great library,
Mitch
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