Improve error message when building Android rules without an SDK. Fixes https://github.com/bazelbuild/bazel/issues/509. Example output: ``` $ bazel build //:all INFO: Found 1 target... ERROR: /usr/local/google/home/ajmichael/.cache/bazel/_bazel_ajmichael/7fcc7480abc634522e5c0cfe6b85b583/external/bazel_tools/tools/android/BUILD:236:1: Executing genrule @bazel_tools//tools/android:no_android_sdk_repository_error failed: Process exited with status 1 [sandboxed]. This build requires an Android SDK. Please add the android_sdk_repository rule to your WORKSPACE. Use --strategy=Genrule=standalone to disable sandboxing for the failing actions. Target //:lib failed to build Use --verbose_failures to see the command lines of failed build steps. INFO: Elapsed time: 0.327s, Critical Path: 0.10s ``` RELNOTES: Attempting to build an Android target without setting up android_sdk_repository will now produce a helpful error message. PiperOrigin-RevId: 155158667
{Fast, Correct} - Choose two
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