message: Fix patchelf URL.
diff: @@ -187,8 +187,8 @@ def configure(cxx_toolkit = None,
  patchelf_version = drake.Version(0, 9)
  patchelf_basename = 'patchelf-%s' % patchelf_version
  patchelf_url = \
  - 'http://releases.nixos.org/patchelf/%s/%s.tar.bz2' % \
  - (patchelf_basename, patchelf_basename)
  + 'https://nixos.org/releases/patchelf/{}/{}.tar.bz2'.format(
  + patchelf_basename, patchelf_basename)
  patchelf_tarball = \
  drake.node('patchelf/%s.tar.bz2' % patchelf_basename)
  patchelf_configure = \
  