[Rpm-maint] [rpm-software-management/rpm] Dynamic Build Dependencies (#593)

[Florian Festi]

Ok, here is the next iteration.
rpmbuild now exits with 11 in case of not met dynamic build dependencies that require re-running the build after installing them.
In this case rpmbuild creates a .buildreqs.rpm package which basically is a srpm which includes the dynamic build dependencies as Requires but does not include the sources (expect the spec file). I may remove more things from that package if it gives a significant performance improvement (%changelog being candidate No. One).
Users (including build tools like mock) are expected to install the dependencies of the .buildreqs.rpm and the restart the build. e.g. with rpmbuild --noprep -ba (or -bb). This can go over multiple iterations. Not being able to install a new dependency should be seen as an error, though, and lead for the building attempt to be stopped.

rpmbuild now supports -br -tr -rr for creating an srpm including the dynamic build dependencies. Note that this requires the static build dependencies and also the rebuild loop just as for building a binary package. 


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