Diego Fernando Nieto authored Nov 10, 2012 and Jean-Baptiste Kempf committed Nov 13, 2012

Modified-by: Edward Wang <edward.c.wang@compdigitec.com>
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

'make fetch' has to fetch sources for all the built packages,
including dependency packages. Conversely, 'make fetch' should not
fetch sources of distro-provided packages, not even dependencies.
This should fix that.

As an minor bonus, 'make .foo' should now work even if foo is
provided by the distro, and conditional build rules should be cleaner.