Build compiler with -Xjvm-default=all + @JvmDefaultCompatibility when needed

compiler/plugin-api/build.gradle.kts

@@ -15,8 +15,4 @@ sourceSets {
     "test" {}
 }
 
-tasks.withType<org.jetbrains.kotlin.gradle.tasks.KotlinCompile>().configureEach {
-    kotlinOptions.freeCompilerArgs += "-Xjvm-default=all-compatibility"
-}
-
 optInToExperimentalCompilerApi()

compiler/plugin-api/src/org/jetbrains/kotlin/compiler/plugin/CommandLineProcessor.kt

@@ -20,6 +20,7 @@ import org.jetbrains.kotlin.config.CompilerConfiguration
 import org.jetbrains.kotlin.config.CompilerConfigurationKey
 
 @ExperimentalCompilerApi
+@JvmDefaultWithCompatibility
 interface CommandLineProcessor {
     val pluginId: String
     val pluginOptions: Collection<AbstractCliOption>