Merge commit 'c003048a77' into merge-2.12-into-2.13.x

* commit 'c003048a77':
  Avoid duplicate repl-jline.properties entries in compiler/packageBin
  Make junit/test pass on JDK 14
  create less objects for zipWithIndex
  Remove debugging println from the build
  Workaround Scaladoc @usecase bug with recent Zinc
  Avoid intermittent "cannot create classes.bak" SBT error.
  Update Scala' build dependencies junit,jol,jackson
  Resort to old-school git HEAD detection in the build
  Restore the working directory of partest, junit to the project root
  Workaround SBT regression to avoid an empty-named JAR entry
  upgrade to sbt 1.3.7 (from 1.2.8)
  sbt 1.2.8 (was 1.2.7)
  Various fixes for sbt 1.2 upgrade
  Upgrade build from sbt 0.13.17 to 1.2.3

Author: dwijnand