bug#43810: ripgrep and fd create .crates.toml which reference to build dir.

[Efraim Flashner <efraim@flashner.co.il>]

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On Mon, Oct 05, 2020 at 03:45:45PM +0800, Zhu Zihao wrote:
> In Guix commit 7cb4440951fa3a91d48c63ac5be123636abfcf82. I found that ripgrep and fd will emit a `.crates.toml` file outside of FHS structure(at the root of profile).
> 
> 
> For example, the .crates.toml file from fd looks like.
> 
> 
> 
> ```
> 
> [v1]
> "fd-find 8.1.1 (path+file:///tmp/guix-build-fd-8.1.1.drv-0/fd-find-8.1.1)" = ["fd"]
> ```
> 
> 
> This file records the build directory, I think we'd better to exclude this to improve the determinisitc(If this file doesn't affect the functionality).
> 
> 
> If we can't exclude it, it's better to place it in a proper place, if we leave it in the root of profile, .crates.toml from different rust apps will override each other.

It turns out this file seems to exist in other crate packages too. I
just checked rust-cbindgen. Luckily the rust bootstrap process doesn't
use the cargo-build-system so it's something we can fix on master and
not staging.

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Efraim Flashner   <efraim@flashner.co.il>   אפרים פלשנר
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