This makes release builds consistent with continuous builds and default
local builds. It also makes it easier to test the Vulkan backend.
Clients who need a smaller APK size can always make their own build.
This also makes filament-android-release.aar go from 1.8M to 2.3M.
Note that we are now including bluevk, vkshaders (for the blit shader),
smol-v (for SPIRV decompression) and vk_mem_alloc (for mem allocation).
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