Make libfutures_io available to DnsResolver

Test: TH
Bug 155855709

Original-Change: https://android-review.googlesource.com/1742082
Merged-In: I87ac190b5e1161b3281ab60348ad084ea3d859fe
Change-Id: I87ac190b5e1161b3281ab60348ad084ea3d859fe
2 files changed