Java: Enable accessibility checks for static inner classes

[Bryce McKinlay]

Static inner classes are subject to the same member accessibility checks 
as regular inner classes, however gcj is currently not calling 
check_nested_class_access() for static inner classes. This patch also 
fixes a bug that was exposed by enabling this check: JDEP_ENCLOSING (the 
context from which the access is being attempted - should really be 
called JDEP_CONTEXT ??) was being set to NULL_TREE for a top level class 
extending a static inner class. The fix is to make "extends" behave the 
same as "implements" and anonymous inner class dependencies.

No testsuite regressions, and a Jacks XPASS for 8.1.3-superclass-6.

OK to commit?

Bryce

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