Dealing with the F-15 mass branch

[Hans de Goede]

Hi,

Traditional we mass branch a lot later in rpmfusion then in
Fedora and that is fine with me (less work). But we do need
to change things so that development builds build from the F-15
repo now, and no longer from rawhide. Otherwise we may start building
against things with incompatible ABI changes. I guess this mostly
requires changes on the builder(s) but I'm not sure.

Regards,

Hans