Update to latest tools and check for failure in appveyor.cmd.

appveyor.cmd

@@ -1,16 +1,14 @@
 @setlocal
 @pushd %~dp0
 
-nuget restore
+nuget restore || exit /b
 
-msbuild -p:Configuration=Release -t:Restore
+msbuild -p:Configuration=Release -t:Restore || exit /b
 
-msbuild -p:Configuration=Release src\test\WixToolsetTest.NetFx\WixToolsetTest.NetFx.csproj
+msbuild -p:Configuration=Release src\test\WixToolsetTest.Netfx\WixToolsetTest.Netfx.csproj || exit /b
+dotnet test -c Release --no-build src\test\WixToolsetTest.Netfx || exit /b
 
-msbuild -p:Configuration=Release -t:Pack src\wixext\WixToolset.NetFx.wixext.csproj
-
-msbuild -p:Configuration=Release src\test\WixToolsetTest.Netfx\WixToolsetTest.Netfx.csproj
-dotnet test -c Release --no-build src\test\WixToolsetTest.Netfx
+msbuild -p:Configuration=Release -t:Pack src\wixext\WixToolset.NetFx.wixext.csproj || exit /b
 
 @popd
 @endlocal

global.json

@@ -1,5 +1,5 @@
 {
   "msbuild-sdks": {
-    "WixToolset.Sdk": "4.0.0-build-0170"
+    "WixToolset.Sdk": "4.0.0-build-0171"
   }
 }