message: Add comments about validation to Vulkan backend.
diff: // srcDirs = ["${android.ndkDirectory}/sources/third_party/vulkan/src/build-android/jniLibs"]
  // }
  //
  +// If gradle claims that your NDK is not installed, try checking what versions you have with
  +// `ls $ANDROID_HOME/ndk` then direct gradle by adding something like this to the "android" section:
  +//
  +// ndkVersion "23.1.7779620"
  +//
  +// Also consider changing the root `gradle.properties` to point to a debug build, although this is
  +// not required for validation if you change the definition of VK_ENABLE_VALIDATION below.
  #if defined(NDEBUG)
  #define VK_ENABLE_VALIDATION 0
  #else
  