RFR: 8072116: [Solaris] : Fix for 8071710 needs to be updated for build dependency checking

[Phil Race]

http://bugs.openjdk.java.net/browse/JDK-8071710 added a depedency
check but it was not working because this depends on file declaration order.

This resolves that which can cause occasional Solaris build failures by
ensuring that HEADLESS is declared before FONTMANAGER.

JDK 9 fix : http://cr.openjdk.java.net/~prr/8072116/
JDK8u fix : http://cr.openjdk.java.net/~prr/8072116.8u

FWIW I've not seen it fail on 8u but it seems like it must be possible 
there too ..

-phil.