[MERGE][0.16] fix problem with SIGQUIT on win32

[Alexander Belchenko]

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This patch fixes this problem introduced by recent patch from Martin.

C:\Temp\win32.fixes>python bzr
Traceback (most recent call last):
  File "bzr", line 77, in <module>
    bzrlib.breakin.hook_sigquit()
  File "C:\Temp\win32.fixes\bzrlib\breakin.py", line 41, in hook_sigquit
    signal.signal(signal.SIGQUIT, _debug)
AttributeError: 'module' object has no attribute 'SIGQUIT'

[µ]
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