Remove invalid 64-bit host objects.

Bug: 16408818

These targets are no longer in use, since we have a proper way to create both
32-bit and 64-bit host libraries in a single build now.

Cherry-pick from AOSP: 03cc1f747c4e92d572a88ec3eb9fde920e871a7e

Change-Id: Icd09f795acd220de5b5e956a8d8e1b4ab4864fa9
3 files changed