Always attach kotlin-android-extensions-runtime library

@Parcelize is now enabled by default, and it requires the runtime library.
Enabling it for all clients is a temporary solution.
In future, the runtime library will be split to two separate artifacts.

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/internal/AndroidExtensionsExtension.kt

@@ -16,8 +16,6 @@
 
 package org.jetbrains.kotlin.gradle.internal
 
-import groovy.lang.Closure
-import org.gradle.util.Configurable
 import java.util.*
 
 enum class CacheImplementation(val optionName: String) {
@@ -39,25 +37,10 @@ enum class AndroidExtensionsFeature(val featureName: String) {
     }
 }
 
-open class AndroidExtensionsExtension : Configurable<AndroidExtensionsExtension> {
-    private lateinit var onEvaluatedHandler: (AndroidExtensionsExtension) -> Unit
-
-    fun setEvaluatedHandler(handler: (AndroidExtensionsExtension) -> Unit) {
-        onEvaluatedHandler = handler
-    }
-
+open class AndroidExtensionsExtension {
     open var isExperimental: Boolean = false
 
     open var features: Set<String> = AndroidExtensionsFeature.values().mapTo(mutableSetOf()) { it.featureName }
 
     open var defaultCacheImplementation: CacheImplementation = CacheImplementation.HASH_MAP
-
-    override fun configure(closure: Closure<*>): AndroidExtensionsExtension {
-        // ConfigureUtil is not used here to prevent infinite recursion
-        closure.resolveStrategy = Closure.DELEGATE_FIRST
-        closure.delegate = this
-        closure.call()
-        onEvaluatedHandler(this)
-        return this
-    }
 }

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/internal/AndroidSubplugin.kt

@@ -43,18 +43,12 @@ import javax.xml.parsers.DocumentBuilderFactory
 class AndroidExtensionsSubpluginIndicator @Inject internal constructor(private val registry: ToolingModelBuilderRegistry) :
     Plugin<Project> {
     override fun apply(project: Project) {
-        val extension = project.extensions.create("androidExtensions", AndroidExtensionsExtension::class.java)
-
-        extension.setEvaluatedHandler { evaluatedExtension ->
-            if (evaluatedExtension.isExperimental) {
-                addAndroidExtensionsRuntimeIfNeeded(project)
-            }
-        }
-
+        project.extensions.create("androidExtensions", AndroidExtensionsExtension::class.java)
+        addAndroidExtensionsRuntime(project)
         registry.register(KotlinAndroidExtensionModelBuilder())
     }
 
-    private fun addAndroidExtensionsRuntimeIfNeeded(project: Project) {
+    private fun addAndroidExtensionsRuntime(project: Project) {
         val kotlinPluginVersion = project.getKotlinPluginVersion() ?: run {
             project.logger.error("Kotlin plugin should be enabled before 'kotlin-android-extensions'")
             return