Skip projects can't import generated BuildConfig.java file

Gradle automatically generates a BuildConfig.java file. It's especially useful for checking if (BuildConfig.DEBUG) { } in Kotlin, because R8/Proguard will automatically eliminate if (false) { } code at compile time. It's a more efficient "is this debug mode?" check than the strategy recommended in the documentation, which checks at runtime whether the application is debuggable. https://skip.tools/docs/faq/#skip_lite_debugflag

Unfortunately, in skip-generated projects, BuildConfig is not available for import for some reason (presumably some confusion around output directories…? I can't figure it out).

To repro:

skip init --transpiled-app --appid=some.app.id app-project AppName
cd app-project/Android
gradle assembleDebug
cat ../.build/Android/app/generated/source/buildConfig/debug/app/name/BuildConfig.java

You'll see a file generated by Gradle like this:

/**
 * Automatically generated file. DO NOT MODIFY
 */
package app.name;

public final class BuildConfig {
  public static final boolean DEBUG = Boolean.parseBoolean("true");
  public static final String APPLICATION_ID = "some.app.id";
  public static final String BUILD_TYPE = "debug";
  public static final int VERSION_CODE = 1;
  public static final String VERSION_NAME = "0.0.1";
}

But if you add this to ContentView.swift:

#if SKIP
import app.name.BuildConfig
#endif

The build will fail:

e: file:///private/tmp/tp/app-project/.build/plugins/outputs/app-project/AppName/destination/skipstone/AppName/src/main/kotlin/app/name/ContentView.kt:13:17 Unresolved reference 'BuildConfig'.

Reproduce from the issue's commands with skip init --transpiled-app, gradle assembleDebug, and the generated BuildConfig.java path under .build/Android. Compare that generated output with the Kotlin source emitted from ContentView.swift, where import app.name.BuildConfig currently fails. Done means the generated project can resolve and import BuildConfig during its build.