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e50aa46fb2
Use non-deprecated CRT function variants on Windows. - introduce `curlx_fdopen()`, `curlx_close()` and use them. Map them to non-deprecated, underscored, CRT functions on Windows. - replace `close()` uses with either `sclose()` (for sockets) or `curlx_close()` (for files). - map `fileno`, `unlink`, `isatty` to their non-deprecated, underscored, versions on Windows. - tool_dirhie: map `mkdir` to `_mkdir` on Windows. - easy: use `_strdup()` on Windows, regardless of how `HAVE_STRDUP` is set. - cmake: assume `HAVE_STRDUP` on Windows. To allow dropping a detection hack using `_CRT_NONSTDC_NO_DEPRECATE` with MSVC. Windows always has `_strdup()` which the code uses, but also needs `HAVE_STRDUP` defined to disable curl's own `strdup()` implementation. - curl_setup.h: drop `_CRT_NONSTDC_NO_DEPRECATE` as no longer necessary. Closes #20212