wget2 | Thread safety issues (#491)

[Tim Rühsen]

Tim Rühsen created an issue: https://gitlab.com/gnuwget/wget2/issues/491



We use several (possible) thread unsafe functions in `libwget/` (nl_langinfo, 
strerror, getenv, getuid). We should move those outside the library, remove or 
replace them appropriately.

Also should we check such usage in `src/` and move them outside the threaded 
code.

`readdir` is thread-safe in glibc (at least in the way we use it).

There is a script attached to check for unsafe functions. For more details: 
https://blog.josefsson.org/2009/06/23/thread-safe-functions/

[find_thread_unsafe](/uploads/92a581ec6993d0f02a081f4945ee2e11/find_thread_unsafe)

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