BIND 10 #855: upgrade asio to 1.4.8

[BIND 10 Development]

#855: upgrade asio to 1.4.8
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                 Reporter:  jelte    |                Owner:  UnAssigned
                     Type:  task     |               Status:  reviewing
                 Priority:  major    |            Milestone:
                Component:           |           Resolution:
  Unclassified                       |            Sensitive:  0
                 Keywords:           |  Add Hours to Ticket:  0
Estimated Number of Hours:  0.0      |          Total Hours:  0
                Billable?:  1        |
                Internal?:  0        |
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Changes (by jelte):

 * owner:  jelte => UnAssigned
 * status:  assigned => reviewing


Comment:

 With this version of asiolink, it seems to compile without local patches.
 One existing -Wno-strict-aliasing we had seems unnecessary now, but
 another aliasing warning got introduced (so i've added -fno-strict-
 aliasing there).

 Also the include unistd.h in scan.cc is now unnecessary.

 Please sanity check and/or build test this :)

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Ticket URL: <http://bind10.isc.org/ticket/855#comment:2>
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