Disable oauth1.h/oauth1.cpp in phone8.0 project.

Author: zhelu2

Release/src/build/sources.proj

@@ -217,14 +217,18 @@
     <ClCompile Include="$(CasablancaSrcDir)\http\listener\http_msg_listen.cpp">
       <Filter>Source Files</Filter>
     </ClCompile>
+  </ItemGroup>
+  
+    <!-- non-TargetXP and non-Phone8.0 files go here-->
+  <ItemGroup Condition ="'$(TargetXP)' != 'true' and '$(PlatformToolset)' != 'v110_wp80'">
 	<ClInclude Include="$(CasablancaIncludeDir)\cpprest\oauth1.h">
       <Filter>Header Files\cpprest</Filter>
     </ClInclude>
     <ClCompile Include="$(CasablancaSrcDir)\http\oauth\oauth1.cpp">
       <Filter>Source Files</Filter>
     </ClCompile>
   </ItemGroup>
-  
+
   <!-- PPLX files for pre-Dev12 toolsets go here -->
   <ItemGroup Condition="'$(PlatformToolset)' == 'v110' or '$(PlatformToolset)' == 'v110_xp' or '$(PlatformToolset)' == 'v110_wp80'">
     <ClCompile Include="$(CasablancaSrcDir)\pplx\pplx.cpp">