This patch reverts part of https://github.com/uutils/coreutils/commit/19901055a24b7c4cd2446b5e05ab572b1d81318d
it seems removing the .iter fixes a warning with newer rust-ini but breaks
the build with older rust-ini

Index: coreutils/Cargo.toml
===================================================================
--- coreutils.orig/Cargo.toml
+++ coreutils/Cargo.toml
@@ -327,7 +327,7 @@ rand_core = "0.9.0"
 rayon = "1"
 regex = "1"
 rstest = "0.25.0"
-rust-ini = "0.21.0"
+rust-ini = ">= 0.18.0"
 same-file = "1.0.6"
 self_cell = "1"
 # Remove the "=" once we moved to Rust edition 2024
Index: coreutils/src/uu/env/src/env.rs
===================================================================
--- coreutils.orig/src/uu/env/src/env.rs
+++ coreutils/src/uu/env/src/env.rs
@@ -162,7 +162,7 @@ fn load_config_file(opts: &mut Options)
 
         for (_, prop) in &conf {
             // ignore all INI section lines (treat them as comments)
-            for (key, value) in prop {
+            for (key, value) in prop.iter() {
                 env::set_var(key, value);
             }
         }