JDK9 RFR of JDK-8029646: [pack200] should support the new zip64 format.

[Alexander Zuev]

Please review my fix for
 JDK-8029646: [pack200] should support the new zip64 format.
  The fix can be found at 
http://cr.openjdk.java.net/~kizune/8029646/webrev.00/

  Bug description is: https://bugs.openjdk.java.net/browse/JDK-8029646

/Alex