Fix futures-macro/METADATA am: b66828d5fa am: c595402c5b am: dcacd7bdda am: d585a3fcef

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/futures-macro/+/1414015

Change-Id: Ia8d5d444199e14bcbe986e08fc18200f5c9309c2