Fix race in cygthread when simplestub is used

[Arto Huusko]

There is a race condition between cygthread::cygthread and
cygthread::simplestub. If cygthread::simplestub is used, it is possible
that "ev" field is never initialized, which leads to hang when
cygthread::operator HANDLE() is called.

2005-07-29  Arto Huusko  <arto.huusko@wmdata.fi>

	* cygthread.cc (cygthread::simplestub): fix race.
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