Modify rt example to also do a set of runs with tasks + SPMD together.

examples/rt/rt.vcxproj

@@ -164,8 +164,9 @@ ispc -O2 %(Filename).ispc -o %(Filename).obj -h %(Filename)_ispc.h
   <ItemGroup>
     <ClCompile Include="rt.cpp" />
     <ClCompile Include="rt_serial.cpp" />
+    <ClCompile Include="tasks_concrt.cpp" />
   </ItemGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">
   </ImportGroup>
-</Project>
+</Project>