These host versions will be used by a future change to enable
the build of SwiftShader on the host, using Android extensions,
without needing to pull in non-host-ported parts of the Android
framework.

These headers are derived from the framework versions, but modified
slightly to minimize their dependency on other headers, and to reduce
code size. If a feature is introduced in the platform that SwiftShader
needs, it will need to be added to these headers (however, even if these
headers were copies, they would still need to be updated.)

Change-Id: I51bf7a01fd782f724d98ff05930117ecacdcefb4
Reviewed-on: https://swiftshader-review.googlesource.com/18030Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Alistair Strachan <astrachan@google.com>