[rfc][icedtea-web] unittests warning cleanup

[Jiri Vanek]

After this clean up only "internal proprietary API and may be removed in a future release" warnings 
remain fro make check.


IcedTea-Web itself is another in queue as warnings have really multiplied.


I would like to backport as much of this clceanup to 1.4 as possible.

J.
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