[tz] [PROPOSED] Support zi parsers that mishandle negative DST offsets

[Paul Eggert]

Michael H Deckers via tz wrote:

>     What is meant here by "DST offset"? The term
>     is not used nor defined in the description of
>     zic input. Do you mean the values in the
>     SAVE column of Rule lines in zic input?
>     Probably not -- the SAVE values in
>     zic input cannot be required to be positive
>     as the value 00:00 must be allowed.

I did mean the SAVE values, but I was sloppy about using "positive" when 
"nonnegative" was intended. Proposed patch attached. Thanks for mentioning this.
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