test msys ci

.github/workflows/msys.yml

+name: Windows Build
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: windows-latest
+    defaults:
+      run:
+        shell: msys2 {0}
+    steps:
+      - uses: actions/checkout@v2
+      - uses: msys2/setup-msys2@v2
+        with:
+          msystem: MINGW64
+          update: true
+          install: >-
+            git
+            mingw-w64-x86_64-toolchain
+            openssl
+            ninja
+            nasm
+            mingw-w64-x86_64-boost
+            mingw-w64-x86_64-wxWidgets
+            mingw-w64-x86_64-cmake
+            mingw-w64-x86_64-icu
+            mingw-w64-x86_64-cmake
+            mingw-w64-x86_64-ffms2
+            mingw-w64-x86_64-glib2
+            mingw-w64-x86_64-python-pip
+      - name: CI-Build
+        run: |
+          MSYSTEM= pip install meson
+          MSYSTEM= meson builddir -Ddefault_library=static
+          ninja -C builddir
+