(Merge 3.2) test.support: don't catch OSError when can_symlink() removes the temporary symbolic link.
(Merge 3.2) test.support: don't catch OSError when can_symlink() removes the
temporary symbolic link.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator