Update AppVeyor for msvc

Author: Simsys

appveyor.yml

@@ -14,6 +14,13 @@ install:
     - set PATH=%QT%\bin\;C:\Qt\Tools\QtCreator\bin\;%PATH%
 
 before_build:
+    - dir "C:\Program Files (x86)"
+    - dir "C:\Program Files (x86)\Microsoft Visual Studio"
+    - dir "C:\Program Files (x86)\Microsoft Visual Studio\2017"
+    - dir "C:\Program Files (x86)\Microsoft Visual Studio\2017\Community"
+    - dir "C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC"
+    - dir "C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Auxiliary"
+    - dir "C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Auxiliary\Build"
     - call "C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Auxiliary\Build\vcvarsall.bat" %PLATFORM%
     - qmake --version
     - echo %PLATFORM%