"cargo_warnings()" function is not present in "cc" crate version 1.0.83.

[nagisa]

Comments for 8aa09f2#comments note that the function we're calling is not available in an older version of cc. Need to find the lowest version of cc we're still building with and bump cc to that.

[luckywaro]

Thank you for your interest in my comment.
The "cargo_warnings()" function seems to have been first added in cc 1.0.85.
( https://github.com/rust-lang/cc-rs/releases/tag/1.0.85 )