Heads-up: changing minimum build number to b115

[Alexander Zvegintsev]

Hi all,

We need to change the minimum JDK 8 version number required for building 
FX to b115 (is currently b113) to fix a problem with GTK initialization 
for Linux distros with GLib version < 2.24.


FX JIRA:  https://javafx-jira.kenai.com/browse/RT-32436

I will push this change shortly.

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Thanks,

Alexander.