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:  vorner               
          Type:  enhancement   |       Status:  reviewing            
      Priority:  minor         |    Milestone:  y2 12 month milestone
     Component:  build system  |   Resolution:                       
      Keywords:                |    Sensitive:  0                    
Estimatedhours:  0.0           |        Hours:  0                    
      Billable:  1             |   Totalhours:  0.5                  
      Internal:  0             |  
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Comment(by vorner):

 The code seems simple and it seems to work, I think it can be merged.

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Ticket URL: <https://bind10.isc.org/ticket/345#comment:4>
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