Remove unneeded default imports in stdlib and tests

libraries/stdlib/js/irRuntime/hacks.kt

@@ -5,8 +5,6 @@
 
 package kotlin
 
-import kotlin.js.*
-
 // TODO: Ignore FunctionN interfaces
 
 public interface Function0<out R> : Function<R> {

libraries/stdlib/js/irRuntime/noPackageHacks.kt

@@ -3,9 +3,6 @@
  * that can be found in the license/LICENSE.txt file.
  */
 
-
-import kotlin.js.*
-
 /** Concat regular Array's and TypedArray's into an Array.
  */
 @PublishedApi
@@ -51,4 +48,4 @@ internal fun <T> primitiveArrayConcat(vararg args: T): T {
 internal inline fun withType(type: String, array: dynamic): dynamic {
     array.`$type$` = type
     return array
-}
+}