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

[Andy Goryachev]

On Sat, 6 Aug 2022 13:22:17 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

>> As @kleopatra noted below, you need to add the hlsl folders that are built on Windows. Add them as an optional source to avoid errors on other OS's:
>> 
>> <classpathentry kind="src" path="build/hlsl/Prism">
>> 	<attributes>
>> 		<attribute name="ignore_optional_problems" value="true"/>
>> 	</attributes>
>> </classpathentry>
>> 
>> And the same for
>> ```<classpathentry kind="src" path="build/gensrc/jsl-prism"/>```
>> ```<classpathentry kind="src" path="build/hlsl/Decora">```
>> ```<classpathentry kind="src" path="build/gensrc/jsl-decora"/>```
>> 
>> This will allow to run dependent projects on Windows and won't cause build issues on other OS's as Eclipse ignores errors on these. There is no need to create empty folders. I tested both on Windows and Linux.
>
> I agree that an optional dependency for a platform-specific generated source directory is a much better solution than creating an empty dir.

@kevinrushforth  : 
Eclipse does not support conditionals in the .classpath files.  The warning cannot be turned off.  I see no other way but to create empty folders.

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