stack traces on fedora and mingw

[Per Bothner]

Per Bothner wrote:

> It's possible my FileChannel changes might be wrong, since
> I did have to change ConcreteProcess.

Yup.  A cut-and-paste error in natPosixProcess.cc:
   new FileChannelImpl(outp[0], FileChannelImpl::WRITE)
should have been:
   new FileChannelImpl(outp[1], FileChannelImpl::WRITE)

I'll check this in shortly.
-- 
	--Per Bothner
per@bothner.com   http://per.bothner.com/