Make Kotlin2JsGradlePluginIT test compatible with gradle 2.x

libraries/tools/kotlin-gradle-plugin/src/test/kotlin/org/jetbrains/kotlin/gradle/Kotlin2JsGradlePluginIT.kt

@@ -5,7 +5,7 @@ import org.junit.Test
 class Kotlin2JsGradlePluginIT : BaseGradleIT() {
     @Test
     fun testBuildAndClean() {
-        val project = Project("kotlin2JsProject", "1.6")
+        val project = Project("kotlin2JsProject", "2.10")
 
         project.build("build") {
             assertSuccessful()
@@ -63,7 +63,7 @@ class Kotlin2JsGradlePluginIT : BaseGradleIT() {
 
     @Test
     fun testNoOutputFileFails() {
-        val project = Project("kotlin2JsNoOutputFileProject", "1.6")
+        val project = Project("kotlin2JsNoOutputFileProject", "2.10")
         project.build("build") {
             assertFailed()
             assertReportExists()

libraries/tools/kotlin-gradle-plugin/src/test/resources/testProject/kotlin2JsProject/mainProject/build.gradle

@@ -30,7 +30,7 @@ compileKotlin2Js.kotlinOptions.outputFile = "${projectDir}/web/js/app.js"
 compileKotlin2Js.kotlinOptions.suppressWarnings = true
 compileKotlin2Js.kotlinOptions.verbose = true
 
-task copyJsFilesFromDependencies(dependsOn: build) {
+build.doLast {
     configurations.compile.each { File file ->
         copy {
             includeEmptyDirs = false