Ensure crate is compiled with std for panic handler am: b0bac706ae am: 00b2d01215

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/siphasher/+/3084686

Change-Id: I05f96b8f1d9c0af09784f1121dbc39d9ec97006c
Signed-off-by: Automerger Merge Worker <[email protected]>