[automerger skipped] Make libfutures_core available to DnsResolver am: 777878a84f -s ours

am skip reason: Merged-In I757232d4d9fea34d4f85789eb7b647f74b74a2f4 with SHA-1 d3adb00666 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/external/rust/crates/futures-core/+/15067044

Change-Id: Iade417e0e1b39a1ca1c50aac72af86e7408ee6ce