vbox: remove version 5.1 CAPI header
vbox: remove version 5.1 CAPI header

Reviewed-by: Michal Privoznik <83d82aaba2eed257f4814b0c239c260c4caaadf0@redhat.com>
Signed-off-by: Daniel P. Berrangé <bb938cf255e055ff3507f2627d214e8e62118fcf@redhat.com>

libvirt/libvirt,nertpinx/libvirt,libvirt/libvirt,nertpinx/libvirt,jardasgit/libvirt,jfehlig/libvirt,jfehlig/libvirt,jardasgit/libvirt,crobinso/libvirt,jardasgit/libvirt,olafhering/libvirt,olafhering/libvirt,fabianfreyer/libvirt,zippy2/libvirt,zippy2/libvirt,libvirt/libvirt,fabianfreyer/libvirt,libvirt/libvirt,nertpinx/libvirt,zippy2/libvirt,olafhering/libvirt,jfehlig/libvirt,fabianfreyer/libvirt,nertpinx/libvirt,crobinso/libvirt,jardasgit/libvirt,zippy2/libvirt,nertpinx/libvirt,crobinso/libvirt,fabianfreyer/libvirt,jfehlig/libvirt,jardasgit/libvirt,fabianfreyer/libvirt,olafhering/libvirt,crobinso/libvirt