Fixes userspace compilation error:

error: ‘DLM_RESNAME_MAXLEN’ undeclared here (not in a function)
  char resource_name[DLM_RESNAME_MAXLEN];
Signed-off-by: NMikko Rapeli <mikko.rapeli@iki.fi>
Signed-off-by: NDavid Teigland <teigland@redhat.com>