[issue7609] Add --with-system-expat option

[Georg Brandl]

Georg Brandl <georg at python.org> added the comment:

The comment "Usage of a system shared libexpat.so/expat.dll is not
advised." just above the change should probably be revised.

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nosy: +georg.brandl

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue7609>
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