appveyor: remove msvc target

It has been replaced by github actions.

Signed-off-by: Lev Stipakov <lev@openvpn.net>

.appveyor.yml

@@ -16,8 +16,6 @@ environment:
       CYGWIN: C:\Cygwin64
       CHOST: x86_64-w64-mingw32
       CC: x86_64-w64-mingw32-gcc
-    - BUILDSYSTEM: VS2019
-      APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
 
 for:
   -
@@ -31,21 +29,3 @@ for:
       - path: openvpn-gui.exe
     on_failure:
       - cmd: appveyor PushArtifact config.log
-  -
-    matrix:
-      only:
-        - BUILDSYSTEM: VS2019
-    install:
-      - cd C:\Tools\vcpkg
-      - git pull
-      - .\bootstrap-vcpkg.bat
-      - .\vcpkg integrate install
-      - .\vcpkg install openssl-windows:x64-windows"
-      - cd %APPVEYOR_BUILD_FOLDER%
-    cache: c:\tools\vcpkg\installed\
-    build:
-      project: openvpn-gui.sln
-    platform: x64
-    configuration: Debug
-    artifacts:
-      - path: x64/Debug/openvpn-gui.exe