0b1fa7fc80
The presence of a special Gradle property is now used to exclude Vulkan support from the build. By making Vulkan "always on" for local development, we can avoid stale CMake cache issues that arise from toggling the Gradle property. It also lets you avoid adding the flag to Android Studio preferences. This is motivated by testing and does not indicate production readiness. Clients still need to pass VULKAN into the Engine constructor to select the Vulkan backend. To keep APK size down and keep CI fast, we are continuing to exclude Vulkan from official Android builds. After syncing this change, you might need to use `./build.sh -c` to clobber various build caches.
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