[rfc][icedtea-web] add support for javafx

[Jiri Vanek]

Hi!

This small patch add support for javafx run via javaws/plugin.

my reproducer is: 
https://www.sonario.com/~alpha/sonario/com.sonario/Releases/release150329/director_sonario_com-mysql.jnlp

and
* my javafx was selfcompiled
* I tried with oracle jdk

Thoughts?

J.
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