RFR: 8212703: Remove sun.java2d.fontpath property from java launcher code

[Phil Race]

Bug : https://bugs.openjdk.java.net/browse/JDK-8212703
Webrev : http://cr.openjdk.java.net/~prr/8212703/

This removes the code in the launcher that sets the sun.java2d.fontpath 
property
from the JAVA2D_FONTPATH environment variable.

We can still set the system property directly when using for debugging but
that is all now internal to the java.desktop module.

-phil.