[IronPython] Invoking delegate to abstract method

[Sanghyeon Seo]

For whatever reasons, IronPython 2.0 Alpha 6 started to invoke
delegate to abstract method. (Previous versions didn't.) This
triggered Mono bug 317488 which is apparently hard to fix.
https://bugzilla.novell.com/show_bug.cgi?id=317488

I developed completely insane workarounds to avoid this problem. Now
you can laugh (or weep).
https://fepy.svn.sourceforge.net/svnroot/fepy/trunk/patches/latest/patch-317488

-- 
Seo Sanghyeon