Add appveyor.yml for Windows-based CI

appveyor.yml

@@ -0,0 +1,21 @@
+version: 1.0.{build}
+
+branches:
+  only:
+    - master
+
+platform:
+  - x64
+
+install:
+  - set MSYSTEM=MSYS
+  - set MSYS="winsymlinks=lnk"
+  - C:\msys64\usr\bin\bash -lc "pacman --needed --noconfirm -Sy pacman-mirrors"
+  - C:\msys64\usr\bin\bash -lc "pacman --noconfirm -Sy"
+  - C:\msys64\usr\bin\bash -lc "pacman -Sy --noconfirm git mingw-w64-x86_64-toolchain mingw-w64-x86_64-freetype mingw-w64-x86_64-icu mingw-w64-x86_64-nspr mingw-w64-x86_64-ca-certificates mingw-w64-x86_64-expat mingw-w64-x86_64-cmake tar diffutils patch patchutils make python2-setuptools"
+  - C:\msys64\usr\bin\easy_install-2.7 pip virtualenv
+  - C:\msys64\usr\bin\bash -lc "mv /mingw64/bin/python2.exe /mingw64/bin/python2-mingw64.exe"
+  - C:\msys64\usr\bin\bash -lc "mv /mingw64/bin/python2.7.exe /mingw64/bin/python2.7-mingw64.exe"
+
+build_script:
+  - C:\msys64\usr\bin\bash mach build -d