edos-builddebcheck should allow to refine the analysis to those
source packages that
- fail due to build-depends (not build-indep-depends) and at the same time
- that have at least one binary package with arch=/=all in the Packages
This would allow to find those cases where one is not able to recompile
an architecture-specific binary package. This behaviour should be an
option, for instance -B like the corresponding option of dpkg-buildpackage.

In addition to the proposed -B falg it might be a good idea to also
implement a separate flag to ignore build-INDEP-relations. This
functionality would be needed anyway in order to implement the -B flag