Enable server sockets on Windows Phone 8.

build/wp8/belle-sip/belle-sip.vcxproj

@@ -56,7 +56,7 @@
   <ItemDefinitionGroup>
     <ClCompile>
       <WarningLevel>Level4</WarningLevel>
-      <PreprocessorDefinitions>WIN32;_WINDOWS;_USRDLL;BELLESIP_EXPORTS;BELLESIP_INTERNAL_EXPORTS;HAVE_POLARSSL;HAVE_TUNNEL;HAVE_ANTLR_STRING_STREAM_NEW;HAVE_COMPILER_TLS;_CRT_SECURE_NO_WARNINGS;_UNICODE;UNICODE;USE_FIXED_NAMESERVERS;PACKAGE_VERSION=$(BELLESIP_PACKAGE_VERSION);%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>WIN32;_WINDOWS;_USRDLL;BELLESIP_EXPORTS;BELLESIP_INTERNAL_EXPORTS;HAVE_POLARSSL;HAVE_TUNNEL;HAVE_ANTLR_STRING_STREAM_NEW;HAVE_COMPILER_TLS;_CRT_SECURE_NO_WARNINGS;_UNICODE;UNICODE;USE_FIXED_NAMESERVERS;ENABLE_SERVER_SOCKETS;PACKAGE_VERSION=$(BELLESIP_PACKAGE_VERSION);%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <AdditionalIncludeDirectories>$(ProjectDir)..\..\..\include;$(ProjectDir)..\..\..\..\antlr3\runtime\C\include;$(ProjectDir)..\..\..\src;$(ProjectDir)..\..\..\..\polarssl\include;$(ProjectDir)..\..\..\..\tunnel\include;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <BasicRuntimeChecks>Default</BasicRuntimeChecks>
       <PrecompiledHeader>NotUsing</PrecompiledHeader>