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

[Igor Gnatenko]

Thinking about this a bit more, rpmbuild should probably get an option to just execute genbr section without checking dependencies. The reason why mock does `--nodeps` because rpmbuild in target environment might be older/compiled with different features so it can't read rpmdb within chroot (because it was populated by other RPM).

So looking at the code, I think:

* `POPT_BR` should set just `RPMBUILD_BUILDREQUIRES` (even when `noDeps` is set so that it ignores BuildRequires from spec, but still does generate additional BuildRequires)
* `RPMBUILD_BUILDREQUIRES` should write `buildreqs.nosrc.rpm` (not `RPMBUILD_CHECKBUILDREQUIRES`)
* It should do only in case there is `%generate_buildrequires` section (writing it always means that all tooling will be slower because every time it would need to run builddep on it)

@ffesti thoughts?

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