Rollup merge of rust-lang#95341 - Meziu:armv6k-3ds-target, r=nagisa

ARMv6K Horizon OS has_thread_local support

cc. ```@ian-h-chamberlain```
cc. ```@AzureMarker```

Being an ARM target, it has always had built-in support for `#[thread_local]`. This PR comes in just now because we were testing `std::thread` support with `thread_local_dtor`s. This will hopefully be the last PR for the target specification, unless anymore features will be needed as time goes on.

compiler/rustc_target/src/spec/armv6k_nintendo_3ds.rs

@@ -37,6 +37,7 @@ pub fn target() -> Target {
             pre_link_args,
             exe_suffix: ".elf".to_string(),
             no_default_libraries: false,
+            has_thread_local: true,
             ..Default::default()
         },
     }