appveyor: use visual studio 2019 & LLVM-9.0.0

appveyor.yml

@@ -1,24 +1,23 @@
-os: Visual Studio 2015
+os: Visual Studio 2019
 
 environment:
   matrix:
   #- platform: Win32
   #  compiler: "Visual Studio 14 2015"
   #  configuration: Debug
   - platform: x64
-    compiler: "Visual Studio 14 2015 Win64"
+    compiler: "Visual Studio 16 2019"
     configuration: Release
     release_arch: "Windows-amd64-32"
 
 install:
   - git submodule update --init --recursive
-  - curl -L https://github.com/CICM/pd-faustgen/releases/download/v0.0.0/llvm-windows-x64-mt.zip -o llvm.zip
+  - curl -L https://github.com/CICM/pd-faustgen/releases/download/v0.0.0/llvm-9.0.0-windows-x64-mt.zip -o llvm.zip
   - 7z x llvm.zip
-  - rename llvm-windows-x64-mt llvm
   - curl http://faust.grame.fr/images/faust-quick-reference.pdf -o ./external/faust-quick-reference.pdf
 build_script:
   - mkdir build && cd build
-  - cmake .. -G "%compiler%" -DUSE_LLVM_CONFIG=off -DLLVM_DIR=./llvm/lib/cmake/llvm
+  - cmake .. -G "%compiler%" -A x64 -DUSE_LLVM_CONFIG=off -DLLVM_DIR=./llvm/lib/cmake/llvm
   - msbuild faustgen~.sln /nologo /p:config=%configuration% /p:plateform=%platform%
 after_build:
   - cd %APPVEYOR_BUILD_FOLDER%