BIND 10 #345: remove dependency on pthreads from asio

[BIND 10 Development]

#345: remove dependency on pthreads from asio
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  Reporter:  jinmei        |            Owner:  jreed
      Type:  enhancement   |           Status:  new  
  Priority:  minor         |        Milestone:       
 Component:  build system  |         Keywords:       
 Sensitive:  0             |   Estimatedhours:  0    
     Hours:  0             |         Billable:  1    
Totalhours:  0             |         Internal:  0    
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 Right now we need to link some tests explicitly with libpthreads even if
 we currently don't use threads.

 I believe I figured out why this happened, and will propose a change to
 eliminate the dependency.

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Ticket URL: <http://bind10.isc.org/ticket/345>
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