RFR: 8290473: update Eclipse .classpath in apps, buildSrc [v2]

[Andy Goryachev]

On Sat, 6 Aug 2022 13:33:09 GMT, Nir Lisker <nlisker at openjdk.org> wrote:

>> I agree that an optional dependency for a platform-specific generated source directory is a much better solution than creating an empty dir.
>
> I don't know what the platform-specific ones are for Mac. I can check on Linux if there's a problem running dependent projects with/without the sources and I think that it will cover Mac too.

@nlisker : 
adding sources with <attribute name="ignore_optional_problems" value="true"/> *does not* remove the warning.
also, this warning cannot be turned off.

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PR: https://git.openjdk.org/jfx/pull/858