LDC: Azure Windows CI: Upgrade clang to v8.0.1

Author: kinke

.azure-pipelines/windows.yml

@@ -18,7 +18,7 @@ steps:
     7z x ../ninja.zip > nul
     cd ..
     :: Download & install clang
-    curl -L -o clang.exe http://releases.llvm.org/%CLANG_VERSION%/LLVM-%CLANG_VERSION%-win64.exe
+    curl -L -o clang.exe https://github.com/llvm/llvm-project/releases/download/llvmorg-%CLANG_VERSION%/LLVM-%CLANG_VERSION%-win64.exe
     clang.exe /S
   displayName: Install prerequisites
 - script: |

azure-pipelines.yml

@@ -15,7 +15,7 @@ jobs:
   pool:
     vmImage: 'vs2017-win2016'
   variables:
-    CLANG_VERSION: 8.0.0
+    CLANG_VERSION: 8.0.1
     VSINSTALLDIR: C:\Program Files (x86)\Microsoft Visual Studio\2017\Enterprise\
     EXTRA_CMAKE_FLAGS: -DLLVM_USE_CRT_RELEASE=MT
   strategy: