[Issue 449] include workaround for sun bug 6709297

https://glazedlists.dev.java.net/issues/show_bug.cgi?id=449






------- Additional comments from brands@... Tue Sep 16 19:03:03 +0000 2008 -------
activated jar sealing again because the sun bug is fixed in 1.6u7 and 1.6u10 b27.

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