Patch #491107: Cygwin setup.py import workaround patch

mwh wrote:
> Jason, feel free to complain if you think this isn't
> the right thing to do.

I guess that I would like to complain and reopen this
issue. :,)  I cannot build a Python 2.2.1 with threads
under Cygwin without this patch even though I'm using
Michael's static _socket workaround.  This is due to the
Cygwin fork() problem with DLL base address conflicts
that are triggered by importing many modules during the
setup.py run.  Similar problems can also be caused by
regrtest.py.

Even after my rebase patch is accepted into Cygwin's
setup.exe, I feel this patch will still be necessary.
This is because during the build process, the shared
extensions (i.e., DLLs) will not be rebased yet.  Hence,
the potential for DLL base address conflicts will exist.

One way to obviate this patch is to push the rebase
functionality into Cygwin's ld.  Unfortunately, I don't
think this is likely to happen.  Another possible way,
is to use the yet to be defined and implemented unload
module functionality:

    http://mail.python.org/pipermail/python-dev/2001-December/019028.html

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