Build-depends => change policy wording

[Julian Gilbey <J.D.Gilbey@qmw.ac.uk>]

Given that there are now two sorts of depends, I am changing the
paragraph:

   Packages may not depend on packages with lower priority values. If
   this should happen, one of the priority values will have to be
   adapted.

to read:

   Binary packages may not depend on binary packages with lower
   priority values. If this should happen, one of the priority values
   will have to be adapted.

This is consistent with the changed wording in the packaging manual
introduced by the accepted proposal introducing build-time
dependencies.

Are there any objections?

   Julian

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  Julian Gilbey, Dept of Maths, QMW, Univ. of London. J.D.Gilbey@qmw.ac.uk
        Debian GNU/Linux Developer,  see http://www.debian.org/~jdg