[rfc][icedtea-web] function applet -> js ->applet call deadlock

[Jiri Vanek]

When applet calls JavaScript function, which calls back to appelt, then *mostly* deadlock occurs. I 
made several attempts to fix this more generally, but I was unsuccessful.

So this "hack" is preventing deadlock, maybe also the timeout can be a bit shorter...

Although this is for both head and  1.4, for head some more investigations are needed later.

J.

ps,reproducer in progress.
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