message: elle.reactor: don't run the filesystem test on Windows
  It does not compile currently.  But it probably should.
  See
diff: @@ -579,11 +579,6 @@ def configure(curl_config,
  'timer.hh',
  )
  - sources += drake.nodes(
  - 'filesystem.cc',
  - 'filesystem.hh',
  - 'filesystem_journal.cc',
  - )
  if cxx_toolkit.os in [drake.os.linux, drake.os.macos]:
  sources += drake.nodes(
  'network/unix-domain-server.cc',
  @@ -594,6 +589,11 @@ def configure(curl_config,
  'pthread.hh',
  )
  + sources += drake.nodes(
  + 'filesystem.cc',
  + 'filesystem.hh',
  + 'filesystem_journal.cc',
  + )
  if enable_fuse:
  if cxx_toolkit.os in [drake.os.linux, drake.os.macos]:
  sources += drake.nodes(
  @@ -728,7 +728,7 @@ def configure(curl_config,
  lib_static_link_libs.append(backend_lib)
  if fuse_lib:
  lib_dynamic_link_libs.append(fuse_lib)
  - if dokan_lib is not None:
  + if dokan_lib:
  lib_static_link_libs.append(dokan_lib)
  if cxx_toolkit.os in [drake.os.macos]:
  lib_cxx_config.framework_add('DiskArbitration')
  