Add appveyor scripts to test with MSYS2

appveyor.yml

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+branches:
+  only:
+    - master
+    - appveyor
+
+environment:
+  matrix:
+    - MSYSTEM: MINGW64
+    - MSYSTEM: MINGW32
+
+shallow_clone: true
+test: off
+
+install:
+  # Update core packages
+  - C:\msys64\usr\bin\pacman -Syyuu --noconfirm --noprogressbar
+  # Update non-core packages
+  - C:\msys64\usr\bin\pacman -Suu --noconfirm --noprogressbar
+  # Install required MSYS2 packages
+  - C:\msys64\usr\bin\pacman -S --noconfirm --noprogressbar --needed automake-wrapper make
+  # Now MSYS2 is up to date, do the rest of the install from a bash script
+  - C:\msys64\usr\bin\bash -lc "cd \"$APPVEYOR_BUILD_FOLDER\" && exec ./tools/appveyor-install.sh"
+
+build_script:
+  - C:\msys64\usr\bin\bash -lc "cd \"$APPVEYOR_BUILD_FOLDER\" && exec ./tools/appveyor-build.sh"
+
+cache:
+  - C:\msys64\var\cache\pacman\pkg

tools/appveyor-build.sh

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+#!/usr/bin/bash
+set -e
+
+export CC=gcc
+
+./autogen.sh
+./configure \
+    --host=$MINGW_CHOST \
+    --build=$MINGW_CHOST \
+    --target=$MINGW_CHOST \
+    --disable-shared --enable-static
+make

tools/appveyor-install.sh

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+#!/usr/bin/bash
+set -e
+
+# Install build dependencies for kvazaar
+pacman -S --noconfirm --noprogressbar --needed \
+    $MINGW_PACKAGE_PREFIX-gcc \
+    $MINGW_PACKAGE_PREFIX-yasm
+
+# Delete unused packages to reduce space used in the Appveyor cache
+pacman -Sc --noconfirm