Added "udp_address" and "udp_engine" to enable windows build

Altered VS2015 files to enable building of the library.

builds/msvc/vs2015/libzmq/libzmq.vcxproj

@@ -66,6 +66,14 @@
     <Import Project="$(ProjectDir)..\..\properties\Output.props" />
     <Import Project="$(ProjectDir)$(ProjectName).props" />
   </ImportGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='DebugDLL|Win32'">
+    <Linkage-libsodium />
+    <Option-sodium />
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='ReleaseDLL|x64'">
+    <Linkage-libsodium />
+    <Option-sodium />
+  </PropertyGroup>
   <ItemGroup>
     <ClInclude Include="..\..\..\..\include\zmq.h" />
     <ClInclude Include="..\..\..\..\include\zmq_utils.h" />
@@ -121,6 +129,8 @@
     <ClInclude Include="..\..\..\..\src\server.hpp" />
     <ClInclude Include="..\..\..\..\src\socks.hpp" />
     <ClInclude Include="..\..\..\..\src\socks_connecter.hpp" />
+    <ClInclude Include="..\..\..\..\src\udp_address.hpp" />
+    <ClInclude Include="..\..\..\..\src\udp_engine.hpp" />
     <ClInclude Include="..\..\platform.hpp" />
     <ClInclude Include="..\..\..\..\src\poll.hpp" />
     <ClInclude Include="..\..\..\..\src\poller.hpp" />
@@ -240,6 +250,8 @@
     <ClCompile Include="..\..\..\..\src\thread.cpp" />
     <ClCompile Include="..\..\..\..\src\timers.cpp" />
     <ClCompile Include="..\..\..\..\src\trie.cpp" />
+    <ClCompile Include="..\..\..\..\src\udp_address.cpp" />
+    <ClCompile Include="..\..\..\..\src\udp_engine.cpp" />
     <ClCompile Include="..\..\..\..\src\v1_decoder.cpp" />
     <ClCompile Include="..\..\..\..\src\v1_encoder.cpp" />
     <ClCompile Include="..\..\..\..\src\v2_decoder.cpp" />
@@ -263,4 +275,4 @@
     <ResourceCompile Include="..\..\resource.rc" />
   </ItemGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
-</Project>
+</Project>
\ No newline at end of file

builds/msvc/vs2015/libzmq/libzmq.vcxproj.filters

@@ -241,6 +241,15 @@
     <ClCompile Include="..\..\..\..\src\socket_poller.cpp">
       <Filter>src</Filter>
     </ClCompile>
+    <ClCompile Include="..\..\..\..\src\dish.cpp" />
+    <ClCompile Include="..\..\..\..\src\radio.cpp" />
+    <ClCompile Include="..\..\..\..\src\timers.cpp" />
+    <ClCompile Include="..\..\..\..\src\udp_address.cpp">
+      <Filter>src</Filter>
+    </ClCompile>
+    <ClCompile Include="..\..\..\..\src\udp_engine.cpp">
+      <Filter>src</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="..\..\..\..\include\zmq_utils.h">
@@ -522,6 +531,15 @@
     <ClInclude Include="..\..\..\..\src\decoder_allocators.hpp">
       <Filter>src\include</Filter>
     </ClInclude>
+    <ClInclude Include="..\..\..\..\src\dish.hpp" />
+    <ClInclude Include="..\..\..\..\src\radio.hpp" />
+    <ClInclude Include="..\..\..\..\src\timers.hpp" />
+    <ClInclude Include="..\..\..\..\src\udp_address.hpp">
+      <Filter>src\include</Filter>
+    </ClInclude>
+    <ClInclude Include="..\..\..\..\src\udp_engine.hpp">
+      <Filter>src\include</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <Filter Include="include">