regression caused by fix of bug #13691

[Bruno Haible]

I wrote:
> I therefore propose to
>   - revert Tulio's "fix",
>   - remove vi_VN.TCVN/TCVN5712-1 from localedata/SUPPORTED, and
>   - resolve BZ #13691 as "Won't fix".
> 
> Patch attached.

Of course the unit test that exercises the vi_VN.TCVN locale also has to
be removed (otherwise it will fail). Revised patch attached.

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