There is an updated pull request by tranzystorekk against master on the void-packages repository

https://github.com/tranzystorekk/void-packages rust
https://github.com/void-linux/void-packages/pull/49437

[WIP] Rust 1.77
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#### Testing the changes
- I tested the changes in this PR: **NO** (cargo fails to build)

Cargo 1.77 started using features from git2 0.18 that we currently patch back to 0.17 to accommodate libgit2 1.6:
https://github.com/rust-lang/cargo/blob/3fe68eabf93cbf3772bbcad09a9206c783e2de3f/src/cargo/sources/git/utils.rs#L1108-L1110

The simplest way forward is probably to stop downgrading git2, but that requires merging https://github.com/void-linux/void-packages/pull/45976 first.

Also had to manually disable optimized-compiler-builtins as they are incorrectly enabled by default: https://github.com/rust-lang/rust/pull/119556

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A patch file from https://github.com/void-linux/void-packages/pull/49437.patch is attached