Add BackgroundResolver to Windows build.

windows/ZeroTierOne/ZeroTierOne.vcxproj

@@ -44,6 +44,7 @@
     <ClCompile Include="..\..\node\Topology.cpp" />
     <ClCompile Include="..\..\node\Utils.cpp" />
     <ClCompile Include="..\..\one.cpp" />
+    <ClCompile Include="..\..\osdep\BackgroundResolver.cpp" />
     <ClCompile Include="..\..\osdep\Http.cpp" />
     <ClCompile Include="..\..\osdep\OSUtils.cpp" />
     <ClCompile Include="..\..\osdep\WindowsEthernetTap.cpp" />
@@ -101,6 +102,7 @@
     <ClInclude Include="..\..\node\Switch.hpp" />
     <ClInclude Include="..\..\node\Topology.hpp" />
     <ClInclude Include="..\..\node\Utils.hpp" />
+    <ClInclude Include="..\..\osdep\BackgroundResolver.hpp" />
     <ClInclude Include="..\..\osdep\Http.hpp" />
     <ClInclude Include="..\..\osdep\OSUtils.hpp" />
     <ClInclude Include="..\..\osdep\Phy.hpp" />

windows/ZeroTierOne/ZeroTierOne.vcxproj.filters

@@ -174,6 +174,9 @@
     <ClCompile Include="ZeroTierOneService.cpp">
       <Filter>Source Files\windows\ZeroTierOne</Filter>
     </ClCompile>
+    <ClCompile Include="..\..\osdep\BackgroundResolver.cpp">
+      <Filter>Source Files\osdep</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="resource.h">
@@ -338,6 +341,9 @@
     <ClInclude Include="ZeroTierOneService.h">
       <Filter>Header Files\windows\ZeroTierOne</Filter>
     </ClInclude>
+    <ClInclude Include="..\..\osdep\BackgroundResolver.hpp">
+      <Filter>Header Files\osdep</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <ResourceCompile Include="ZeroTierOne.rc">