[PATCH 3/4] rust: Add SPDX headers to alloc::vec::{spec_extend, set_len_on_drop}

[Asahi Lina <lina@asahilina.net>]

Add the missing SPDX headers to these modules, which were just imported
from the Rust stdlib. Doing this in a separate commit makes it easier to
audit that the files have not been modified in the original import.

See the precending two commits for attribution and licensing details.

Signed-off-by: Asahi Lina <lina@asahilina.net>
---
 rust/alloc/vec/set_len_on_drop.rs | 2 ++
 rust/alloc/vec/spec_extend.rs     | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/rust/alloc/vec/set_len_on_drop.rs b/rust/alloc/vec/set_len_on_drop.rs
index 8b66bc812129..448bf5076a0b 100644
--- a/rust/alloc/vec/set_len_on_drop.rs
+++ b/rust/alloc/vec/set_len_on_drop.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: Apache-2.0 OR MIT
+
 // Set the length of the vec when the `SetLenOnDrop` value goes out of scope.
 //
 // The idea is: The length field in SetLenOnDrop is a local variable
diff --git a/rust/alloc/vec/spec_extend.rs b/rust/alloc/vec/spec_extend.rs
index 1ea9c827afd7..ade317ab96b2 100644
--- a/rust/alloc/vec/spec_extend.rs
+++ b/rust/alloc/vec/spec_extend.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: Apache-2.0 OR MIT
+
 use crate::alloc::Allocator;
 use core::iter::TrustedLen;
 use core::ptr::{self};

-- 
2.35.1