Removed scala-xml dependency from scalacticDotty.

Author: cheeseng

project/scalatest.scala

@@ -597,7 +597,6 @@ object ScalatestBuild {
       projectTitle := "Scalactic",
       organization := "org.scalactic",
       initialCommands in console := "import org.scalactic._",
-      libraryDependencies ++= scalaXmlDependency(scalaVersion.value),
       sourceGenerators in Compile += {
         Def.task{
           // From scalactic-macro