[Build] Restore compressed content.xml for platform repository #3191
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Include the additional IU 'org.eclipse.equinox.executable' directly in the platform P2-repository via the defining 'category.xml'. This avoids the post-processing of the raw 'content.xml' file using an XSL transformation and consequently ensures the 'content.xml' is only provided in compressed form as 'content.jar' and 'content.xml.xz'. Due to the previous post-processing the content.xml was only provided uncompressed, which increases the load on the download-server, slows down metadata downloads and also complicates the RelEng process.
Fixes
This was originally introduced via
and reverted due to a regression in I-builds via
The change is introduced again unchanged as the cause of that regression is fixed via
This reverts commit d4d0542.