[Dune] [#631] Document the ENABLE_FOO buildsystem trick

[Dune]

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The following task is now closed:

FS#631 - Document the ENABLE_FOO buildsystem trick
User who did this - Christoph Grüninger (gruenich)

Reason for closing: Implemented
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http://www.dune-project.org/flyspray/index.php?do=details&task_id=631

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