[rfc][icedtea-web] test and enable Entry-Point atribute check

[Jiri Vanek]

hi!

Entry-Point was implemented for 1.6 but... it somehow get missed in final call.

The following one-liner  pathc is enabling the check, and  the rest are tests for its basic 
behcaviour. After patch, all pass. Before patch all whcich should prevent the app from running, fails.

Should go to head and 1.6

J.
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