build using wxWidget as a subproject

appveyor.yml

@@ -11,11 +11,6 @@ install:
   - cmd: set PATH=%cd%;%PYTHON_ROOT%;%PYTHON_ROOT%\Scripts;%PATH%
   # Install meson and ninja
   - cmd: pip install ninja meson
-  # download wxWidgets
-  - cmd: mkdir %WXWIN%
-  - cmd: chdir %WXWIN%
-  - cmd: curl -L -o wxWidgets.7z https://github.com/wxWidgets/wxWidgets/releases/download/v3.1.3/wxWidgets-3.1.3.7z
-  - cmd: 7z x wxWidgets.7z
   # Download ICU
   - cmd: mkdir %ICUWIN%
   - cmd: chdir %ICUWIN%
@@ -24,11 +19,6 @@ install:
   # Set up the build environment
   - cmd: set BOOST_ROOT=C:\Libraries\boost_1_73_0
   - cmd: '"C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Auxiliary\Build\vcvarsall.bat" x86_amd64'
-  # build wxWidgets
-  - cmd: chdir %WXWIN%\build\msw
-  - cmd: nmake -f makefile.vc BUILD=release COMPILER_PREFIX=vc142_x64 SHARED=1
-  - cmd: nmake -f makefile.vc BUILD=release COMPILER_PREFIX=vc142_x64 SHARED=1 UNICODE=0
-  - cmd: chdir %APPVEYOR_BUILD_FOLDER%
 
 build_script:
   - cmd: meson --backend=ninja --buildtype release -Dwx_path=%WXWIN% -Dicu_path=%ICUWIN% builddir