Merge "Make libfutures_core available to DnsResolver" am: 587c7ec73e am: 116fe54ed9

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/futures-core/+/1742084

Change-Id: Ibb48f4ddc473ff4ab86fff9dc1351c1f2e5e04b7