Fix webbrowser.py security bug: be more careful about what we pass to os.system(). This closes Python bug #500401, Debian bug #127507.
Fix webbrowser.py security bug: be more careful about what we pass to
os.system().
This closes Python bug #500401, Debian bug #127507.

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