[tz] Swiss time selectable for Germany

[Paul Eggert]

On 2023-01-07 18:01, Benjamin Drung via tz wrote:
> The "present if and only if" could be checked by some tool.

"make check" has been doing that since release 96k. However, I just now 
tested it and found a bug in the check when applied to the zone1970.tab 
format introduced in 2014f. I fixed the bug by installing the attached 
proposed patch.
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