Update MiMaFilters

Author: odersky

project/MiMaFilters.scala

@@ -26,6 +26,8 @@ object MiMaFilters {
     ProblemFilters.exclude[MissingClassProblem]("scala.runtime.stdLibPatches.language$experimental$clauseInterleaving$"),
     ProblemFilters.exclude[MissingFieldProblem]("scala.runtime.stdLibPatches.language#experimental.into"),
     ProblemFilters.exclude[MissingClassProblem]("scala.runtime.stdLibPatches.language$experimental$into$"),
+    ProblemFilters.exclude[MissingFieldProblem]("scala.runtime.stdLibPatches.language#experimental.relaxedExtensionImports"),
+    ProblemFilters.exclude[MissingClassProblem]("scala.runtime.stdLibPatches.language$experimental$relaxedExtensionImports$"),
     // end of New experimental features in 3.3.X
 
     // Added java.io.Serializable as LazyValControlState supertype