[Lucene-java Wiki] Update of "ReleaseNote64" by UweSchindler

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The "ReleaseNote64" page has been changed by UweSchindler:
https://wiki.apache.org/lucene-java/ReleaseNote64?action=diff&rev1=15&rev2=16

Comment:
Add note about the impossibility to build this release from source with latest Java 8 security update

  Further details of changes are available in the change log available at:
  http://lucene.apache.org/core/6_4_0/changes/Changes.html
  
+ Please note, this release cannot be built from source with
+ Java 8 update 121, use an earlier version instead! This is
+ caused by a bug introduced into the Javadocs tool shipped
+ with that update. The workaround was too late for this
+ Lucene release. Of course, you can use the binary
+ artifacts.
+ 
  Please report any feedback to the mailing lists
  (http://lucene.apache.org/core/discussion.html)