[Lazarus] Patch for TreeFontTyle AVLTree

[AlexeyT]

https://github.com/graemeg/lazarus/commit/34d02cea12df535b67cb07f45d02e2b06134dc66

better this (Result can be any int!)

begin

   Result:= TFreeTypeGlyph(Item1).Index - TFreeTypeGlyph(Item2).Index;

end;

-- 
Regards,
Alexey

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