[Pkg-rust-maintainers] fakeupstream.cgi: add redirector for crates.io website

[Angus Lees]

Package: qa.debian.org
Severity: wishlist
Tags: patch

The standard packaging tool for the Rust programming language ("cargo")
distributes package sources via the https://crates.io/ website.
Unfortunately for uscan, the dynamic content for this website is all served
via JSON.  According to a discussion with upstream[*], the upstream
infrastructure isn't able to easily serve HTML-formatted dynamic content at
this time.

The attached patch adds a wrapper to fakeupstream.cgi to reformat the
relevant "versions" JSON blob as uscan-friendly HTML.  Please apply.

[*] Upstream discussion: https://github.com/rust-lang/crates.io/issues/238

Thanks!
 - Gus
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