[xml] [patch] DSO/Module support via libltdl

[Joel Reed <joelwreed comcast net>]

Here's a new cut of the DSO/module patch. This time using
libltdl. Added comments and a readme as well. The readme
explains the current code. i'm hoping this could be applied
and improved upon (by win32 folks and those who want to 
sed the ltdl symbols :)

jr

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