ntoskrnl.exe: add RtlInitializeGenericTableAvl/RtlInsertElementGenericTableAvl stubs (try 2)

[Austin English]

Allows makeappx.exe (from
https://bugs.winehq.org/show_bug.cgi?id=38737) to start. Before, it
crashed without showing anything, after, when invoked with no options,
it shows its help menu (as well as the next issue).

-- 
-Austin
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