[Bug libstdc++/124539] Unimplemented rules for chrono::tzdb parsing of tzdata.zi file

[tkaminsk at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124539
Bug 124539 depends on bug 123510, which changed state.

Bug 123510 Summary: chrono::tzdb parser should be case insensitive
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123510

           What    |Removed                     |Added
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             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED