Build/build-tests.bat: Use MSBUILD in Visual Studio 2015

Author: angularsen

Build/build-tests.bat

@@ -1,3 +1,3 @@
 @echo off
 SET ROOT=%~dp0..
-%WinDir%\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe %ROOT%\Build\tests.msbuild /verbosity:normal /p:Configuration=Release /p:Platform="AnyCPU" /target:CleanAndBuild /p:RestorePackages=false
+"C:\Program Files (x86)\MSBuild\14.0\Bin\MsBuild.exe" %ROOT%\Build\tests.msbuild /verbosity:normal /p:Configuration=Release /p:Platform="AnyCPU" /target:CleanAndBuild /p:RestorePackages=false