This also alters the fix to #11603. Specifically, setting __repr__ to
object.__str__ now raises a recursion RuntimeError when str() or repr() is
called instead of silently bypassing the recursion. I believe this behavior is
more correct.

Skip long repr tests when the cached pyc file's path length would exceed the maximum Win32 path length.
This should fix a failure on one of the XP buildbots.

Patch by Dionysios Kalofonos.

Patch by Dionysios Kalofonos.

Original patch by Peter Otten.

Original patch by Peter Otten.

Patch from Mark Shannon.

importlib.machinery.(FileFinder, SourceFileLoader,
_SourcelessFileLoader, ExtensionFileLoader).

This exposes all of importlib's mechanisms that will become public on
the sys module.