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Before this patch, `libhostname.so` and `chkhostname` were a test facility for overriding `gethostname()` in non-debug builds on Linux and other Unix platforms supporting `LD_PRELOAD`. `gethostname()` has a single use with SMTP. The alternative way to override `gethostname()` is building in debug mode, which allows to do this via the `CURL_GETHOSTNAME` env, on all platforms. Drop the `LD_PRELOAD` solution in favour of the above. Also: - delete inactive NTLM code with a `gethostname()` call made from it. - streamline NTLM code by dropping a `printf()` and a macro. - tests: stop setting `CURL_GETHOSTNAME` where unnecessary. Closes #14695