BIND 10 #2214: import/export decoration for DLLs

[BIND 10 Development]

#2214: import/export decoration for DLLs
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            Reporter:  fdupont       |                        Owner:
                Type:  enhancement   |                       Status:  new
            Priority:  medium        |                    Milestone:  New
           Component:  Unclassified  |  Tasks
           Sensitive:  0             |                     Keywords:
         Sub-Project:  Core          |              Defect Severity:  N/A
Estimated Difficulty:  0             |  Feature Depending on Ticket:
         Total Hours:  0             |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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 DLLs require import/export decoration,
 !__declspec(dllimport)/!__declspec(dllexport) on WIN32 for instance.
 The idea is:
  - add a dll.h in all library directories
  - decorate external symbols
  - in rare cases force the instantiation of classes (e.g., util/buffer.cc)
 (current reference is trac2117)

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Ticket URL: <http://bind10.isc.org/ticket/2214>
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