rust: alloc: add missing SPDX-License-Identifiers

These should have been there in the last `alloc` version upgrade.

Signed-off-by: Miguel Ojeda <[email protected]>

rust/alloc/boxed/thin.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: Apache-2.0 OR MIT
+
 // Based on
 // https://github.com/matthieu-m/rfc2580/blob/b58d1d3cba0d4b5e859d3617ea2d0943aaa31329/examples/thin.rs
 // by matthieu-m

rust/alloc/ffi/c_str.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: Apache-2.0 OR MIT
+
 #[cfg(test)]
 mod tests;
 

rust/alloc/ffi/mod.rs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: Apache-2.0 OR MIT
+
 //! Utilities related to FFI bindings.
 //!
 //! This module provides utilities to handle data across non-Rust