BIND 10 #293: fix to build error for in house base_n headers with older boost

[BIND 10 Development]

#293: fix to build error for in house base_n headers with older boost
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  Reporter:  jinmei        |            Owner:  jreed                      
      Type:  defect        |           Status:  new                        
  Priority:  major         |        Milestone:  06. 4th Incremental Release
 Component:  build system  |         Keywords:                             
 Sensitive:  0             |   Estimatedhours:  0                          
     Hours:  0             |         Billable:  1                          
Totalhours:  0             |         Internal:  0                          
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 Could someone take a look at r2552?

 It affects the builder and is quite trivial, I've directly committed it to
 trunk.  But the approach may be controversial, getting second opinion (if
 any) would be nice.

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Ticket URL: <http://bind10.isc.org/ticket/293>
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