Rollup merge of rust-lang#118835 - Urgau:fix-rccg-gcc-tests, r=matthiaskrgr

Fix again `rustc_codegen_gcc` tests

Similar to rust-lang#118706

r? `@GuillaumeGomez`

Author: matthiaskrgr

compiler/rustc_codegen_gcc/example/mini_core.rs

@@ -4,7 +4,7 @@
     thread_local
 )]
 #![no_core]
-#![allow(dead_code, internal_features)]
+#![allow(dead_code, internal_features, ambiguous_wide_pointer_comparisons)]
 
 #[no_mangle]
 unsafe extern "C" fn _Unwind_Resume() {