jobctrl extension broken on non-windows platforms

[Fernando Perez]

Bug reported originally by Tony Mannucci on list. Here's how to reproduce it:

In [1]: ls *.zip
wrapping.zip

In [2]: import jobctrl

In [3]: ls *.zip
---------------------------------------------------------------------------
NameError Traceback (most recent call last)

/home/fperez/tmp/<ipython console> in <module>()

/home/fperez/usr/lib/python2.5/site-packages/IPython/iplib.pyc in <lambda>(cmd)
    496 # and it allows interpolation of variables in the user's namespace.
    497 self.system = lambda cmd: \
--> 498 self.hooks.shell_hook(self.var_expand(cmd,depth=2))
    499
    500 # These are for getoutput and getoutputerror:

/home/fperez/usr/lib/python2.5/site-packages/IPython/hooks.pyc in __call__(self, *args, **kw)
    133 #print "prio",prio,"cmd",cmd #dbg
    134 try:
--> 135 ret = cmd(*args, **kw)
    136 return ret
    137 except ipapi.TryNext, exc:

/home/fperez/usr/lib/python2.5/site-packages/IPython/Extensions/jobctrl.pyc in jobctrl_shellcmd(ip, cmd)
    209 try:
    210 p = Popen(cmd,shell = use_shell)
--> 211 except WindowsError:
    212 if use_shell:
    213 # try with os.system

NameError: global name 'WindowsError' is not defined