message: Windows: Update in common_env.sh
  Respect TMPDIR if it's already set.
diff: # * Bazel windows executable copied as "bazel.exe" and included in PATH.
  # Use a temporary directory with a short name.
  -export TMPDIR="C:/tmp"
  +export TMPDIR=${TMPDIR:-"C:/tmp"}
  +export TMPDIR=$(cygpath -m "$TMPDIR")
  mkdir -p "$TMPDIR"
  # Set bash path
  