Please review for 8u40 this improvement to allow delegation of building native libraries to the custom/closed build.
Issue: JDK-8057751 <https://bugs.openjdk.java.net/browse/JDK-8057751> CompileNativeLibraries for custom build
Webrev: http://cr.openjdk.java.net/~rriggs/webrev-native-lib-8057751/ <http://cr.openjdk.java.net/%7Erriggs/webrev-native-lib-8057751/>
Thanks, Roger
