adapt to scala/scala#7624

Author: SethTisue

shared/src/main/scala-2.13/scala/xml/ScalaVersionSpecific.scala

@@ -24,7 +24,3 @@ private[xml] trait ScalaVersionSpecificNodeSeq
 private[xml] trait ScalaVersionSpecificNodeBuffer { self: NodeBuffer =>
   override def className: String = "NodeBuffer"
 }
-
-private[xml] trait ScalaVersionSpecificIterableSerializable[+A] extends Iterable[A] {
-  protected[this] override def writeReplace(): AnyRef = this
-}

shared/src/main/scala/scala/xml/MetaData.scala

@@ -82,7 +82,6 @@ abstract class MetaData
   extends AbstractIterable[MetaData]
   with Iterable[MetaData]
   with Equality
-  with ScalaVersionSpecificIterableSerializable[MetaData]
   with Serializable {
 
   /**

shared/src/main/scala/scala/xml/NodeSeq.scala

@@ -44,7 +44,7 @@ object NodeSeq {
  *
  *  @author  Burak Emir
  */
-abstract class NodeSeq extends AbstractSeq[Node] with immutable.Seq[Node] with ScalaVersionSpecificNodeSeq with Equality with ScalaVersionSpecificIterableSerializable[Node] with Serializable {
+abstract class NodeSeq extends AbstractSeq[Node] with immutable.Seq[Node] with ScalaVersionSpecificNodeSeq with Equality with Serializable {
   def theSeq: Seq[Node]
   def length = theSeq.length
   override def iterator = theSeq.iterator