ci: Remove AppVeyor config

appveyor.bat

@@ -1,39 +0,0 @@
-rem Matrix-driven Appveyor CI script for xqemu, borrowed from https://github.com/mypaint/libmypaint
-rem Currently only does MSYS2 builds.
-rem https://www.appveyor.com/docs/installed-software#mingw-msys-cygwin
-rem Needs the following vars:
-rem    MSYS2_ARCH:  x86_64 or i686
-rem    MSYSTEM:  MINGW64 or MINGW32
-
-rem Set the paths appropriately
-PATH C:\msys64\%MSYSTEM%\bin;C:\msys64\usr\bin;%PATH%
-
-rem Install required tools
-bash -xlc "pacman --noconfirm -S --needed base-devel"
-
-rem Install the relevant native dependencies
-bash -xlc "pacman --noconfirm -S --needed git"
-bash -xlc "pacman --noconfirm -S --needed make"
-bash -xlc "pacman --noconfirm -S --needed autoconf"
-bash -xlc "pacman --noconfirm -S --needed automake-wrapper"
-bash -xlc "pacman --noconfirm -S --needed mingw-w64-x86_64-libtool"
-bash -xlc "pacman --noconfirm -S --needed mingw-w64-x86_64-pkg-config"
-bash -xlc "pacman --noconfirm -S --needed mingw-w64-x86_64-glib2"
-bash -xlc "pacman --noconfirm -S --needed mingw-w64-x86_64-SDL2"
-bash -xlc "pacman --noconfirm -S --needed mingw-w64-x86_64-pixman"
-bash -xlc "pacman --noconfirm -S --needed mingw-w64-x86_64-libepoxy"
-
-rem Invoke subsequent bash in the build tree
-cd %APPVEYOR_BUILD_FOLDER%
-set CHERE_INVOKING=yes
-
-rem Build/test scripting
-bash -xlc "set pwd"
-bash -xlc "env"
-
-IF "%1%" == "Release" (
-    bash -xlc "./build.sh --release"
-) ELSE (
-    bash -xlc "./build.sh"
-)
-

appveyor.yml

@@ -1,18 +0,0 @@
-environment:
-  matrix:
-    - MSYS2_ARCH: x86_64
-      MSYSTEM: MINGW64
-
-configuration:
-  - Release
-  - Debug
-
-build_script:
-  - '%APPVEYOR_BUILD_FOLDER%\appveyor.bat %CONFIGURATION%'
-
-deploy: off
-
-artifacts:
-  - path: dist
-    name: xqemu
-    type: zip