Replace deprecated join with joinToString

ant/src/org/jetbrains/kotlin/ant/Kotlin2JsTask.kt

@@ -52,7 +52,7 @@ public class Kotlin2JsTask : KotlinCompilerBaseTask() {
         // TODO: write test
         library?.let {
             args.add("-library-files")
-            args.add(it.list().map { File(it).canonicalPath }.join(separator = ","))
+            args.add(it.list().joinToString(separator = ",") { File(it).canonicalPath })
         }
 
         outputPrefix?.let {

ant/src/org/jetbrains/kotlin/ant/Kotlin2JvmTask.kt

@@ -54,7 +54,7 @@ public class Kotlin2JvmTask : KotlinCompilerBaseTask() {
 
         compileClasspath?.let {
             args.add("-classpath")
-            args.add(it.list().join(pathSeparator))
+            args.add(it.list().joinToString(pathSeparator))
         }