Remove duplicate order

build/buildorder.props

@@ -13,7 +13,7 @@
     <RepositoryBuildOrder Include="Antiforgery" Order="10" RootPath="$(RepositoryRoot)src\Antiforgery\" />
     <RepositoryBuildOrder Include="IISIntegration" Order="10" RootPath="$(RepositoryRoot)src\IISIntegration\" />
     <RepositoryBuildOrder Include="StaticFiles" Order="11" RootPath="$(RepositoryRoot)src\StaticFiles\" />
-    <RepositoryBuildOrder Include="ResponseCaching" Order="11" Order="11" RootPath="$(RepositoryRoot)src\ResponseCaching\" />
+    <RepositoryBuildOrder Include="ResponseCaching" Order="11" RootPath="$(RepositoryRoot)src\ResponseCaching\" />
     <RepositoryBuildOrder Include="Session" Order="11" RootPath="$(RepositoryRoot)src\Session\" />
     <RepositoryBuildOrder Include="ServerTests" Order="11" RootPath="$(RepositoryRoot)src\ServerTests\" />
     <RepositoryBuildOrder Include="CORS" Order="12"  RootPath="$(RepositoryRoot)src\CORS\" />