Build some samples on AppVeyor with CMake

Remove unused toolsets.
Remove extra popd.

build/tools/appveyor.bat

@@ -52,32 +52,6 @@ bash -lc "g++ --version"
 bash -lc "LDFLAGS=-L/usr/lib/w32api ./configure --disable-optimise --disable-shared && make -j3 && make -j3 -C tests"
 goto :eof
 
-:cmake_msys
-if "%MSYSTEM%"=="" set MSYSTEM=MINGW32
-path C:\msys64\%MSYSTEM%\bin;C:\msys64\usr\bin;%path%
-set GENERATOR=MSYS Makefiles
-set SKIPTESTS=1
-set SKIPINSTALL=1
-set CMAKE_NATIVE_FLAGS=-j3
-goto cmake
-
-:cmake_cygwin
-C:\cygwin\setup-x86.exe -qnNdO -R C:/cygwin -s http://cygwin.mirror.constant.com -l C:/cygwin/var/cache/setup -P libjpeg-devel -P libpng-devel -P libtiff-devel -P libexpat-devel
-path c:\cygwin\bin;%path%
-set GENERATOR=Unix Makefiles
-set SKIPTESTS=1
-set SKIPINSTALL=1
-set CMAKE_NATIVE_FLAGS=-j3
-goto cmake
-
-:cmake_mingw
-:: CMake requires a path without sh (added by git on AppVeyor)
-path C:\Program Files (x86)\CMake\bin;C:\MinGW\bin
-set GENERATOR=MinGW Makefiles
-set SKIPTESTS=1
-set CMAKE_NATIVE_FLAGS=-j3
-goto cmake
-
 :cmake_qt
 set SKIPINSTALL=1
 set QT5DIR="C:\Qt\5.11\msvc2015_64"
@@ -106,7 +80,7 @@ set WX_INSTALL_PATH=%HOMEDRIVE%%HOMEPATH%\wx_install_target
 mkdir %WX_INSTALL_PATH%
 mkdir build_cmake
 pushd build_cmake
-cmake -G "%GENERATOR%" -DwxBUILD_TESTS=%BUILD_TESTS% -DCMAKE_INSTALL_PREFIX=%WX_INSTALL_PATH% -DwxBUILD_SHARED=%SHARED% %CMAKE_CONFIGURE_FLAGS% ..
+cmake -G "%GENERATOR%" -DwxBUILD_TESTS=%BUILD_TESTS% -DwxBUILD_SAMPLES=SOME -DCMAKE_INSTALL_PREFIX=%WX_INSTALL_PATH% -DwxBUILD_SHARED=%SHARED% %CMAKE_CONFIGURE_FLAGS% ..
 if ERRORLEVEL 1 goto error
 echo.
 echo --- Starting the build
@@ -141,7 +115,6 @@ if NOT "%SKIPINSTALL%"=="1" (
     echo --- Building minimal sample with installed library
     cmake --build . --config %CONFIGURATION% -- %CMAKE_LOGGER%
     if ERRORLEVEL 1 goto error
-    popd
 )
 popd