[Varnish] #1230: Refine header check in bin/varnishd/mgt/mgt.h, mgt_main.c for uClibc

[Varnish]

#1230: Refine header check in bin/varnishd/mgt/mgt.h, mgt_main.c  for uClibc
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 Reporter:  basile@…  |       Owner:  phk
     Type:  defect    |      Status:  new
 Priority:  normal    |   Milestone:
Component:  varnishd  |     Version:  trunk
 Severity:  normal    |  Resolution:
 Keywords:            |
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Comment (by Poul-Henning Kamp <phk@…>):

 In [881dcc3d7e2384ccf6f56de162ceebbe75d68384]:
 {{{
 #!CommitTicketReference repository=""
 revision="881dcc3d7e2384ccf6f56de162ceebbe75d68384"
 Remove a pseudo-bogus test for pthreads in the manager process.

 The subsequent cleanup/separation of .h files makes this test
 much less important, and it's not like it is a conclusive or
 comprehensive test in the first place.

 Fixes   #1230
 }}}

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Ticket URL: <https://www.varnish-cache.org/trac/ticket/1230#comment:2>
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