"linker `link.exe` not found" fix

[tomasApo]

Warned windows users that they need C++ visual studio tools. If not installed cargo with complain "linker link.exe not found". Included /visualstudio.microsoft.com link

[rust-highfive]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @jamesmunns (or someone else) soon.

Please see the contribution instructions for more information.

[bors[bot]]

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