This is part of the upstream sync (Net/Open/Free BSDs expose the nameser.h in their public headers). Change-Id: Ib063d4e50586748cc70201a8296cd90d2e48bbcf
Bug: 13219633 Change-Id: I3435ef7564b9ad3c7b54188a0809440993b36c9e
Bug: 13219633 Change-Id: Ide43add0b90b3081cc709a22d1ff1f59d65f1104