JDK-8028531: Need review of a make change for the JAB - for a backport into 7u60

[Pete Brunet]

Please review the following 8 to 7u backport change for the make of the
Java Access Bridge.  This change was needed due to build differences
between 8 and 7u. 

http://cr.openjdk.java.net/~ptbrunet/JDK-8028531/

The change has already been privately reviewed but an open review is
also needed.

Thanks, Pete