do not use aapt gen source root for generating stub BuildConfig.java, because it may be not excluded (when R.java is generated by maven); use aidl source root instead

plugins/android/src/org/jetbrains/android/facet/AndroidRootUtil.java

@@ -385,7 +385,7 @@ public class AndroidRootUtil {
   @Nullable
   public static String getBuildconfigGenSourceRootPath(@NotNull AndroidFacet facet) {
     // todo: return correct path for mavenized module when it'll be supported
-    return getAptGenSourceRootPath(facet);
+    return getAidlGenSourceRootPath(facet);
   }
 
   @Nullable