Windows: Drop MSVC builds (broken paths in gpg)

Signed-off-by: Lukas Holecek <hluk@email.cz>

appveyor.yml

@@ -10,12 +10,6 @@ environment:
       CMAKE_GENERATOR: MinGW Makefiles
       MINGW_PATH: C:\Qt\Tools\mingw730_32
 
-    - QTDIR: C:\Qt\5.12.6\msvc2017_64
-      CMAKE_GENERATOR: Visual Studio 16 2019
-      CMAKE_GENERATOR_ARCH: x64
-      CMD_VCVARS: 'C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Auxiliary\Build\vcvars64.bat'
-      BUILD_SUB_DIR: Debug
-
 # Parameters for default build commands (build_script is used instead).
 build:
 

utils/appveyor/install.bat

@@ -7,9 +7,7 @@ dir %QTDIR%\bin || goto :error
 dir %QTDIR%\lib\cmake || goto :error
 
 REM Note: Following removes sh.exe from PATH so that CMake can generate MinGW Makefile.
-if DEFINED MINGW_PATH set PATH=%MINGW_PATH%\bin;%PATH:C:\Program Files\Git\usr\bin;=%
-
-if DEFINED CMD_VCVARSALL call %CMD_VCVARSALL%
+PATH=%MINGW_PATH%\bin;%PATH:C:\Program Files\Git\usr\bin;=%
 
 :error
 exit /b %errorlevel%