[foreign] RFR Refactoring Header and LibraryDependencies annotations into a single NativeLibrary annotation

[Sundararajan Athijegannathan]

* Refactoring Header and LibraryDependencies as a single annotation 
called "NativeLibrary".
* Removing unused 'native method handle' returning method in 
LibrariesHelper.

Webrev: 
http://cr.openjdk.java.net/~sundar/nativelibrary_annotation_refactoring/webrev.00/

Thanks,
-Sundar