Android CTS 7.0 Release 16 (4438873)
Hack together a NDK android-24 platform

This is not the same as the android-24 platform in the r11c NDK or in
downstream branches, since other parts of the NDK necessary for that
aren't being updated in this branch.

Instead, this is just a copy of android-23, with the addition of
Vulkan headers and libraries from the real r11c NDK.

When this change is merged into downstream branches that already have
the full NDK prebuilt, it should be skipped in favor of the existing
NDK.

Bug: 28263117
Change-Id: I35ba31534047a4c17a000cb20abbbbbcf762c044
5760 files changed