Previously, the built-in examples assembly step of the build system set the final_folder parameter of the unzip target to the true final installation location of the examples.

The behavior of the unzip target is to only unzip the archive if final_folder doesn't exist. Because that folder will exist any time a previous build has been done and ant clean was not run, the archive will not be unzipped. This causes the build to fail after an update to the built-in examples version when it attempts to copy the examples from the
version-dependent extraction staging folder to the final location.

The fix is to set the final_folder parameter to the version-dependent staging folder location, which will cause the extraction to happen every time the examples version is updated, but to be skipped when there was no update.

See #10734 (comment) for an explanation of the problem, and the steps to reproduce it here: #10734 (comment). (Thanks matthijskooijman!)

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