spec: Run all make jobs in parallel
spec: Run all make jobs in parallel

Commit e8861f69714f changed our spec file to compile and run
tests in parallel. That's a very good step forward, but why
stop there? Let's run *all* make jobs in parallel and really
put those expensive cores to use!

On my laptop, this shaves ~10s off 'make rpm'.

VenkatDatta/libvirt,crobinso/libvirt,datto/libvirt,zippy2/libvirt,nertpinx/libvirt,zippy2/libvirt,nertpinx/libvirt,olafhering/libvirt,VenkatDatta/libvirt,taget/libvirt,datto/libvirt,zippy2/libvirt,olafhering/libvirt,andreabolognani/libvirt,olafhering/libvirt,crobinso/libvirt,taget/libvirt,jfehlig/libvirt,fabianfreyer/libvirt,andreabolognani/libvirt,fabianfreyer/libvirt,nertpinx/libvirt,olafhering/libvirt,andreabolognani/libvirt,jardasgit/libvirt,eskultety/libvirt,VenkatDatta/libvirt,eskultety/libvirt,eskultety/libvirt,VenkatDatta/libvirt,fabianfreyer/libvirt,taget/libvirt,jardasgit/libvirt,jardasgit/libvirt,taget/libvirt,libvirt/libvirt,libvirt/libvirt,datto/libvirt,eskultety/libvirt,fabianfreyer/libvirt,eskultety/libvirt,jfehlig/libvirt,nertpinx/libvirt,datto/libvirt,libvirt/libvirt,fabianfreyer/libvirt,jfehlig/libvirt,jfehlig/libvirt,jardasgit/libvirt,libvirt/libvirt,nertpinx/libvirt,datto/libvirt,taget/libvirt,crobinso/libvirt,VenkatDatta/libvirt,andreabolognani/libvirt,andreabolognani/libvirt,zippy2/libvirt,jardasgit/libvirt,crobinso/libvirt