qemu: command: Error on accel2d
qemu: command: Error on accel2d

qemu doesn't have any accel2d support wired up. Explicitly error
if a user tries it out, or typos the accel3d option

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