postgresqlPackages.pgvecto-rs: fix build with rust 1.89

The `dangerous_implicit_autorefs` lint now causes a compile error [1],
which breaks pgvecto-rs.
This commit forces the lint to only throw a warning.

[1]: rust-lang/rust#141661

Author: diogotcorreia

pkgs/servers/sql/postgresql/ext/pgvecto-rs/0002-allow-dangerous-implicit-autorefs.diff

@@ -0,0 +1,21 @@
+diff --git a/crates/common/src/lib.rs b/crates/common/src/lib.rs
+index 18172b9..6fc7e82 100644
+--- a/crates/common/src/lib.rs
++++ b/crates/common/src/lib.rs
+@@ -1,3 +1,4 @@
++#![warn(dangerous_implicit_autorefs)]
+ pub mod clean;
+ pub mod dir_ops;
+ pub mod file_atomic;
+diff --git a/src/lib.rs b/src/lib.rs
+index 068c65d..82609e9 100644
+--- a/src/lib.rs
++++ b/src/lib.rs
+@@ -6,6 +6,7 @@
+ #![allow(clippy::needless_range_loop)]
+ #![allow(clippy::single_match)]
+ #![allow(clippy::too_many_arguments)]
++#![warn(dangerous_implicit_autorefs)]
+ 
+ mod bgworker;
+ mod datatype;

pkgs/servers/sql/postgresql/ext/pgvecto-rs/package.nix

@@ -27,6 +27,9 @@ buildPgrxExtension (finalAttrs: {
     (replaceVars ./0001-read-clang-flags-from-environment.diff {
       clang = lib.getExe clang;
     })
+    # Rust 1.89 denies implicit autorefs by default, making the compilation fail.
+    # This restores the behaviour of previous rust versions by making the lint throw a warning instead.
+    ./0002-allow-dangerous-implicit-autorefs.diff
   ];
 
   src = fetchFromGitHub {