[libc-commits] [libc] change the return value type of mktime_internal to time_t (PR #132231)

[Joseph Huber via libc-commits]

https://github.com/jhuber6 approved this pull request.

`git clang-format HEAD~1` should fix whitespace automatically. One nit.

https://github.com/llvm/llvm-project/pull/132231