message: For windows builds, add timestamps to each command logged when run under msys.
diff: @@ -30,6 +30,9 @@ export TMPDIR=${TMPDIR:-"C:/tmp"}
  export TMPDIR=$(cygpath -m "$TMPDIR")
  mkdir -p "$TMPDIR"
  +# Add timestamps before each command.
  +export PS4='+ $(date) + '
  +
  # Set bash path
  export BAZEL_SH=${BAZEL_SH:-"C:/tools/msys64/usr/bin/bash"}
  