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This fixes most of the errors building with a newer toolchain, etc.
(I still have to
./gradlew sdk:assembleRelease extractNdk
before trying to do anything with hellocardboard-android, but it does build and build nicely now.)Additionally, I added CMake options to control the optional parts of the Cardboard SDK. This is likely to be appreciated by downstream users who can reduce their diff against the official SDK by just configuring these variables, instead of editing the CMake file.