Unzipping the source bundle creates three directories: control, hotspot, and
j2se. It should instead create a single directory, openjdk, that contains
those three directories.

The top-level openjdk directory should also contain the following files, which
are currently buried in j2se/make:

  ASSEMBLY_EXCEPTION
  LICENSE
  README-builds.html
  README.html
  THIRD_PARTY_README

It's okay, for now, for these files to be copies of what's in j2se/make if
that's the easiest way to implement it.