bug#57840: rust-sqlite3-src bundles sqlite3

[Maxime Devos <maximedevos@telenet.be>]

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X-Debbugs-CC: Aleksandr Vityazev <avityazev@posteo.org>
X-Debbugs-CC: Nicolas Goaziou <mail@nicolasgoaziou.fr>

(^ the pseudo-header, IIUC)

The patch series 53315 by Aleksandr Vityazev and accepted by Nicolas 
Goaziou adds a crate rust-sqlite3-src that bundles sqlite3.

Bundling is against Guix policy for the reasons explained in the manual

I ask to:

  (a) Remove the bundled copy (and if needed, adjust build.rs to always
      do the pkg-config)

or

  (b) Remove rust-sqlite3-src and dependents.

Additionally, for the future, I ask to check packages for bundling,  and 
recommend the following tricks for detecting bundling:

   * if a crate name ends with -sys, there is a good chance it bundles
     things
   * likewise, if the synopsis or description mentions 'Bindings',
     there's a good chance it bundles things.
   * if a crate name contains some variation of the word 'source'
     (e.g., -src), that can indicate bundling.
   * if the Cargo.toml mentions 'bundled', 'system' or 'vendor' its
     [features], it is bundling things.
   * if the source code of a Rust package contains a .c or .h file,
     it's likely bundling things

I would like to note that the bundled copy (version 3.34.1) has known 
bugs that were fixed in later versions (including a CVE), according to 
the changelog on the sqlite website.

Greetings,
Maxime

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