[VS2019] Fix CI build

Signed-off-by: Vitalii Koshura <lestat.de.lionkur@gmail.com>

appveyor.yml

@@ -70,7 +70,6 @@ skip_commits:
     - xcompile/
 
 configuration:
-#  - Debug
   - Release
 
 environment:
@@ -101,6 +100,7 @@ before_build:
   - if %TOOLCHAIN_VERSION%==10.0 call git apply boinc_vs2010.sln.ci.patch
   - if %TOOLCHAIN_VERSION%==12.0 call "%VS120COMNTOOLS%\vsvars32.bat"
   - if %TOOLCHAIN_VERSION%==12.0 call rmdir /S /Q %localappdata%\Microsoft\VisualStudio\%TOOLCHAIN_VERSION%\ComponentModelCache
+  - if %TOOLCHAIN_VERSION%==16.0 call "C:\Tools\vcpkg\vcpkg.exe" integrate remove
   - if %TOOLCHAIN_VERSION%==16.0 call "C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\Common7\Tools\vsdevcmd.bat"
 
 build_script: