[tz] file asia needs Link for Asia/Hanoi

[Alois Treindl]

I think file asia should have a line

Link Asia/Bangkok Asia/Hanoi

If this is absent, and file backzone is not compiled, no binary file for 
Hanoi gets created.
This breaks all references to it.

For all other zones in backzone, a Link line exists so that a binary 
file is always created.

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