[Varnish] #1837: Compiling error if probe is defined after backend

[Varnish]

#1837: Compiling error if probe is defined after backend
----------------------+-------------------
 Reporter:  fgsch     |      Owner:
     Type:  defect    |     Status:  new
 Priority:  normal    |  Milestone:
Component:  varnishd  |    Version:  trunk
 Severity:  normal    |   Keywords:
----------------------+-------------------
 If a probe is referenced before the backend is defined varnishd will fail
 to compile the VCL:

 {{{
 Message from C-compiler:
 vgc.c:968:12: error: \xe2\x80\x98vgc_probe_p\xe2\x80\x99 undeclared here
 (not in a function)
 .probe = &vgc_probe_p,
           ^
 Running C-compiler failed, exited with 1
 }}}

 Test attached.

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Ticket URL: <https://www.varnish-cache.org/trac/ticket/1837>
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