In the build --without-threads, catching an ImportError in support.py
fails. Fedora buildbot:

http://www.python.org/dev/buildbot/all/builders/AMD64%20Fedora%20without%20threads%203.x/builds/1986/steps/test/logs/stdio

./python  ./Tools/scripts/run_tests.py -j 1 -u all -W --timeout=3600 
Traceback (most recent call last):
  File "/home/buildbot/buildarea/3.x.krah-fedora/build/Lib/runpy.py", line 160, in _run_module_as_main
    "__main__", fname, loader, pkg_name)
  File "/home/buildbot/buildarea/3.x.krah-fedora/build/Lib/runpy.py", line 73, in _run_code
    exec(code, run_globals)
  File "/home/buildbot/buildarea/3.x.krah-fedora/build/Lib/test/__main__.py", line 1, in <module>
    from test import regrtest, support
  File "<frozen importlib._bootstrap>", line 1038, in _handle_fromlist
  File "<frozen importlib._bootstrap>", line 977, in _find_and_load
  File "<frozen importlib._bootstrap>", line 561, in load_module
  File "<frozen importlib._bootstrap>", line 218, in module_for_loader_wrapper
  File "<frozen importlib._bootstrap>", line 446, in _load_module
  File "/home/buildbot/buildarea/3.x.krah-fedora/build/Lib/test/regrtest.py", line 243, in <module>
    from test import support
  File "<frozen importlib._bootstrap>", line 1038, in _handle_fromlist
  File "<frozen importlib._bootstrap>", line 977, in _find_and_load
  File "<frozen importlib._bootstrap>", line 561, in load_module
  File "<frozen importlib._bootstrap>", line 218, in module_for_loader_wrapper
  File "<frozen importlib._bootstrap>", line 446, in _load_module
  File "/home/buildbot/buildarea/3.x.krah-fedora/build/Lib/test/support.py", line 34, in <module>
    import multiprocessing.process
SystemError: NULL result without error in PyObject_Call
[110893 refs]
make: *** [buildbottest] Error 255