Add import clauses for ImplicitConversions

Author: Philippus

shared/src/main/scala/scala/util/parsing/combinator/JavaTokenParsers.scala

@@ -14,6 +14,7 @@ package scala
 package util.parsing.combinator
 
 import scala.annotation.migration
+import scala.language.implicitConversions
 
 /** `JavaTokenParsers` differs from [[scala.util.parsing.combinator.RegexParsers]]
  *  by adding the following definitions:

shared/src/main/scala/scala/util/parsing/combinator/lexical/StdLexical.scala

@@ -18,6 +18,7 @@ package lexical
 import token._
 import input.CharArrayReader.EofCh
 import scala.collection.mutable
+import scala.language.implicitConversions
 
 /** This component provides a standard lexical parser for a simple,
  *  [[http://scala-lang.org Scala]]-like language. It parses keywords and