Following up on r1619121 and r1619129, stop creating legacy property conflict
marker skels in the workqueue, by using the new direct DB option of the marker
write code added in r1619129.

* subversion/libsvn_wc/workqueue.c
  (prop_conflict_skel_new,
   prepend_prop_value,
   prop_conflict_skel_add): Remove function.
  (run_prej_install): Just pass a NULL property marker skel to
    svn_wc__create_prejfile instead of creating a legacy skel here.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1619130 13f79535-47bb-0310-9956-ffa450edef68