Add Wpa81 to BuildAll.proj

Rx.NET/Source/BuildAll.proj

@@ -27,6 +27,12 @@
     <Flavor Include="Rx.sln">
       <Configuration>Release8</Configuration>
     </Flavor>
+    <Flavor Include="Rx.sln">
+      <Configuration>Debug81</Configuration>
+    </Flavor>
+    <Flavor Include="Rx.sln">
+      <Configuration>Release81</Configuration>
+    </Flavor>
     <Flavor Include="Rx.sln">
       <Configuration>DebugPL</Configuration>
     </Flavor>
@@ -110,4 +116,4 @@
     <MSBuild Projects="@(ProjectToBuild)" Targets="Rebuild" />
     <MSBuild Projects="@(SetupToBuild)" Targets="Rebuild" />
   </Target>
-</Project>
+</Project>