vircgroup: Update virCgroupGetPercpuStats stump
vircgroup: Update virCgroupGetPercpuStats stump

In the commit 7938b533 we've changed the function signature,
however forgot to update stump that's used on systems without
CGroups causing a build failure.

Signed-off-by: Michal Privoznik <83d82aaba2eed257f4814b0c239c260c4caaadf0@redhat.com>

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