RFR: 8261300: jpackage: rewrite while(0)/while(false) to proper blocks [v2]

[Aleksey Shipilev]

On Tue, 9 Feb 2021 00:06:19 GMT, Alexander Matveev <almatvee at openjdk.org> wrote:

>> Aleksey Shipilev has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   More cleanup in tstrings.cpp
>
> Marked as reviewed by almatvee (Committer).

I had to redo `tstrings.cpp` to fix Windows failure. Turns out there was a `break` that exited the fake loop. I streamlined that code.

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PR: https://git.openjdk.java.net/jdk/pull/2454