RFR: JDK-8068033: Fix Java Launcher for splash screen.

[Kumar Srinivasan]

Hi,

Appreciate a review of this fix for JNI correctness when dealing with 
Splash Screen
on MacOSX.

http://cr.openjdk.java.net/~ksrini/8068033/webrev.0/

Sergey, I think you took over from Anthony Petrov for SplashScreen, if
not please have someone in your team look it over.

Thanks
Kumar