MSVC++ (2013) property sheet for building tcp/ip programs. Currently just links

in WinSock (wsock32.lib), but might add the IP Helper lib or other cfg
properties later.

src/build/tcpip.props

+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ImportGroup Label="PropertySheets" />
+  <PropertyGroup Label="UserMacros" />
+  <PropertyGroup>
+    <_PropertySheetDisplayName>TCP/IP Networking</_PropertySheetDisplayName>
+  </PropertyGroup>
+  <ItemDefinitionGroup>
+    <Link>
+      <AdditionalDependencies>wsock32.lib;%(AdditionalDependencies)</AdditionalDependencies>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemGroup />
+</Project>
\ No newline at end of file