* List dependencies of subpackages as part of the source packages
dependencies, knowing the subpackage they are coming from does
not matter to a build scheduler as long as xbps-src requires
those to exist in the same way to main depends= have to exist.
* Resolve virtual? packages through existing means in xbps-src to
avoid duplicating and possibly diverting from xbps-src's
behaviour in tools that use dbulk-dump.
* Filter out dependencies on the template itself from sub packages,
this matches the xbps-src behaviour and there is no need to
have to duplicate logic for this into the scheduling tool.
* Error out on archs= restrictions as we do already on broken=
and nocross=, there shouldn't be the need to discover archs=
restrictions when attempting to build the package.
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