RFR: 8290473: update Eclipse .classpath in apps, buildSrc [v6]

[Kevin Rushforth]

On Tue, 9 Aug 2022 00:52:36 GMT, Nir Lisker <nlisker at openjdk.org> wrote:

>> I respectfully disagree.  
>> I see no harm in creating empty directories in this case if it solves the problem.  
>> We can log a bug against eclipse, and it will be fixed in several years, if ever.
>
> This is up to Kevin. It's changing the build file specifically to remove a warning for Eclipse Mac users. I don't mind. Might need to do the same for the other OS-specific folders.

While not ideal, I suppose it's OK. I'm still amazed that Eclipse doesn't have the notion of optional source paths. How do people deal with this when debugging the JDK? Many modules (`java.base` and `java.desktop`, just to name two) have entire directories of platform-specific sources.

I will review the changes to `build.gradle`.

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