[libc-commits] [libc] [libc][NFC] Fix missing field 'tm_isdst' initializer warning (PR #67837)

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michaelrj-google wrote:

would it be easier to just make the struct say `int tm_isdst = 0;` in the definition, instead of updating all of the constructions?

https://github.com/llvm/llvm-project/pull/67837