[Tile-serving] [osm2pgsql-dev/osm2pgsql] Replace fmt::localtime with localtime_r (PR #2457)

[Jochen Topf]

joto left a comment (osm2pgsql-dev/osm2pgsql#2457)

https://en.cppreference.com/w/c/chrono/localtime.html says `localtime_r` is C23, but the man page says its in POSIX.1-1196 and SUSv2, so that's plenty old enough for our use case. But [it doesn't look like MSVC supports it](https://learn.microsoft.com/en-us/cpp/c-runtime-library/reference/localtime-localtime32-localtime64). And, in fact, the code in `fmt` is much more complicated than in your commit. Looks like we need to use `localtime_s` for Windows.

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