[libvirt] make dist failed

[Wen Congyang]

make dist failed with the following error:

make[1]: Entering directory `/home/wency/source/libvirt/src'
  GEN    rpc/virnetprotocol.h
  GEN    rpc/virnetprotocol.c
  GEN    rpc/virkeepaliveprotocol.h
  GEN    rpc/virkeepaliveprotocol.c
  GEN    remote/remote_protocol.h
  GEN    remote/remote_protocol.c
  GEN    remote/qemu_protocol.h
  GEN    remote/qemu_protocol.c
  GEN    remote/qemu_client_bodies.h
  GEN    util/virkeymaps.h
  CC     libvirt_driver_remote_la-remote_protocol.lo
In file included from ./remote/remote_protocol.h:17,
                 from ./remote/remote_protocol.c:7:
./internal.h:300:31: error: libvirt_probes.h: No such file or directory