[Varnish] #1546: vrt.h contains various director related declarations that are no longer referenced.

[Varnish]

#1546: vrt.h contains various director related declarations that are no longer
referenced.
----------------------+-------------------
 Reporter:  daghf     |      Owner:
     Type:  defect    |     Status:  new
 Priority:  normal    |  Milestone:
Component:  varnishd  |    Version:  trunk
 Severity:  normal    |   Keywords:
----------------------+-------------------
 In particular,

 {{{
 struct vrt_dir_random_entry
 struct vrt_dir_random
 struct vrt_dir_dns_entry
 struct vrt_dir_dns
 }}}

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Ticket URL: <https://www.varnish-cache.org/trac/ticket/1546>
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