RFR: JDK-8186115 - libelf still referenced after 8172670

[Bob Vandette]

Please review these changes for JDK 10 that remove all dependencies on libelf from the JDK
build system.

Bug:
https://bugs.openjdk.java.net/browse/JDK-8186115

Webrev:
http://cr.openjdk.java.net/~bobv/8186115/ <http://cr.openjdk.java.net/~bobv/8186115/>

Compiler team:  Please check CodeSectionProcessor.  Is the stepping through all
foreign call still necessary?  I only removed the comment.

Thanks,
Bob.