RFR: 8289255: update Eclipse .classpath and other configuration files

[Kevin Rushforth]

On Mon, 27 Jun 2022 23:53:00 GMT, Andy Goryachev <duke at openjdk.org> wrote:

>> gradlew line 4:
>> 
>>> 2: 
>>> 3: #
>>> 4: # Copyright © 2015-2021 the original authors.
>> 
>> The changes in `gradlew` look fine. I'm surprised the file wasn't already UTF-8.
>
> I could have left it alone, but these things bother me...

Since this is a 3rd-party file, it's probably best to fix it separately the next time we update it, though.

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PR: https://git.openjdk.org/jfx/pull/804