RFR: JDK-8043160: JDK 9 Build failure in accessbridge

[Erik Joelsson]

Hello,

This patch attempts to fix a build problem in accessbridge. Two compile 
jobs are both trying to create the same header file. The fix is to 
separate the output directories of these jobs so that they do not 
interfere with each other.

Bug: https://bugs.openjdk.java.net/browse/JDK-8043160
Webrev: http://cr.openjdk.java.net/~erikj/8043160/webrev.jdk.01/

/Erik