Auto merge of rust-lang#117608 - matthiaskrgr:rollup-g9fagmv, r=matthiaskrgr

Rollup of 4 pull requests

Successful merges:

 - rust-lang#116017 (Don't pass `-stdlib=libc++` when building C files on macOS)
 - rust-lang#117524 (bootstrap/setup: create hooks directory if non-existing)
 - rust-lang#117588 (Remove unused LoadResult::DecodeIncrCache variant)
 - rust-lang#117596 (Add diagnostic items for a few of core's builtin macros)

r? `@ghost`
`@rustbot` modify labels: rollup

Author: bors

core/src/macros/mod.rs

@@ -1044,6 +1044,7 @@ pub(crate) mod builtin {
     #[stable(feature = "rust1", since = "1.0.0")]
     #[rustc_builtin_macro]
     #[macro_export]
+    #[rustc_diagnostic_item = "env_macro"] // useful for external lints
     macro_rules! env {
         ($name:expr $(,)?) => {{ /* compiler built-in */ }};
         ($name:expr, $error_msg:expr $(,)?) => {{ /* compiler built-in */ }};
@@ -1074,6 +1075,7 @@ pub(crate) mod builtin {
     #[stable(feature = "rust1", since = "1.0.0")]
     #[rustc_builtin_macro]
     #[macro_export]
+    #[rustc_diagnostic_item = "option_env_macro"] // useful for external lints
     macro_rules! option_env {
         ($name:expr $(,)?) => {{ /* compiler built-in */ }};
     }
@@ -1479,6 +1481,7 @@ pub(crate) mod builtin {
     #[stable(feature = "rust1", since = "1.0.0")]
     #[rustc_builtin_macro]
     #[macro_export]
+    #[rustc_diagnostic_item = "include_macro"] // useful for external lints
     macro_rules! include {
         ($file:expr $(,)?) => {{ /* compiler built-in */ }};
     }