[PMC] Fix what would be a nasty bug in EventHandler's invoke().
[PMC] Fix what would be a nasty bug in EventHandler's invoke().

I don't like the encapsulation violation, but there's no good way to extract a
Parrot_Interp from a ParrotInterpreter PMC, or to call invoke() on it.

This needs more testing.

git-svn-id: 6e74a02f85675cec270f5d931b0f6998666294a3@23302 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

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