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

[Dune]

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The following task has a new comment added:

FS#631 - Document the ENABLE_FOO buildsystem trick
User who did this - Carsten Gräser (Carsten)

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This should also go in the docs (copied from Christians mail):
[...]
HAVE_FOOBAR is supposed to be either false or true. It might be
undefined which is equivalent to false. Thus the correct usage is 

#if HAVE_FOOBAR instead of 
#idef HAVE_FOOBAR. ENABLE_FOOBAR is not intended for the user. It is
only trick to move the final definition of HAVE_FOOBAR to the
commandline.
[..,]
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