Fix the OSX failures in this test -- they were due to /tmp being a symlink
to /private/tmp.  Adding a call to os.path.realpath() to temp_dir() fixed it.
diff --git a/Lib/test/test_cmd_line_script.py b/Lib/test/test_cmd_line_script.py
index 297efa0..3a8e8f1 100644
--- a/Lib/test/test_cmd_line_script.py
+++ b/Lib/test/test_cmd_line_script.py
@@ -29,6 +29,7 @@
 @contextlib.contextmanager
 def temp_dir():
     dirname = tempfile.mkdtemp()
+    dirname = os.path.realpath(dirname)
     try:
         yield dirname
     finally: