Bug 16656 – move embedded zlib to a separate library

We'd like to get rid of the embedded zlib in phobos. https://github.com/dlang/phobos/tree/fd518eb310a9494cccf28c54892542b052c49669/etc/c/zlib As a shared zlib is available on literally any non-Windows OS, we should prefer using that over statically linking. For Windows we can integrate a DLL and import library with out binary releases, similarly to how we handle libcurl. That means someone documents and builds zlib [¹], we upload the results to downloads.dlang.org/other, and integrate it with the build script [²][³]. [¹]: https://wiki.dlang.org/Curl_on_Windows [²]: https://github.com/dlang/installer/blob/8b3c7efe1e049f73ec5fc526a849904bf80b434d/create_dmd_release/build_all.d#L451 [³]: https://github.com/dlang/installer/blob/8b3c7efe1e049f73ec5fc526a849904bf80b434d/create_dmd_release/build_all.d#L232

Why don't we remove zlib entirely from Phobos and move it to the DUB universe? Isn't this something that we are better off putting into the userland? (same for the sqlite bindings etc.) If there are blocking bugs/issues with DUB, we should rather try to fix those. FYI is already e.g. archive: https://code.dlang.org/packages/archive

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