[tz] Add new timezone for Hanoi Capital, Vietnam

[Paul Eggert]

On 2/17/19 6:40 PM, Tim Parenti wrote:
> perhaps this warrants a brief comment in the "Vietnam" section of the 
> asia file.

Good idea. A proposed patch is attached. This patch also attempts to 
address the issue of whether we should add a separate zone whenever any 
hamlet was taken by one side or the other during the 1970-1975 war in 
Vietnam, a topic you mentioned in a later email.

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