SubProcess _make_inheritable

[Roland Puntaier]

SubProcess.py needs to be patched - at least in 2.4 - to work from
windows GUIs:

def _make_inheritab le(self, handle):
"""Return a duplicate of handle, which is inheritable"""
if handle==None: handle=-1
return DuplicateHandle (GetCurrentProc ess(), handle,
GetCurrentProce ss(), 0, 1,
DUPLICATE_SAME_ ACCESS)