[Pkg-rust-maintainers] Bug#1096103: dh-cargo: Use new substvar assignment syntax for optionally used variables

[Guillem Jover]

Package: dh-cargo
Version: 31
Severity: normal
Tags: patch

Hi!

Prompted by a discussion about lintian warnings about
Static-Built-Using usage (via Holger Levsen), I realized that dh-cargo
was most probably not using the new substvars assignment syntax to
avoid warning when the variables do not get used.

I'm assuming the cargo:Built-Using and the cargo:X-Cargo-Built-Using
are considered obsolete and supported currently for backwards
compatibility until all rust packages have been switched to use
cargo:Static-Built-Using. But it could be that there are legitimate
uses for cargo:Built-Using (due to license compliance)?

Attached an untested patch improving this. (A similar change was
recently applied for dh-golang, which is in a similar situation.)

Thanks,
Guillem
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