[rfc][icedtea-web] fix jdk9 jre recognition

[Jiri Vanek]

Hi!

Now, when one is building itw with jdk9, he have to specify jre. It is pretty simple by something like:
./configure --prefix=/home/jvanek/icedtea-web-image --with-firefox=no 
--with-jdk-home=/usr/lib/jvm/java-1.9.0-openjdk  --with-jre-home=/usr/lib/jvm/java-1.9.0-openjdk

But you really have to specify them both. As jdk9 do noth ave jre direcotry.

This change should happily do it.


J.

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