Add GitHub CI

.github/workflows/c-cpp.yml

@@ -0,0 +1,32 @@
+name: C/C++ CI
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+
+    runs-on: windows-latest
+
+    defaults:
+      run:
+        shell: msys2 {0}
+
+    strategy:
+      matrix:
+        dev-build: ['y', 'n']
+        new-dynarec: ['y', 'n']
+
+    steps:
+    - uses: msys2/setup-msys2@v1
+      with:
+        update: true
+        msystem: MINGW32
+        install: 'make mingw-w64-i686-toolchain mingw-w64-i686-openal mingw-w64-i686-freetype mingw-w64-i686-SDL2 mingw-w64-i686-zlib mingw-w64-i686-libpng'
+    - uses: actions/checkout@v2
+    - name: make
+      run: make -fwin/makefile.mingw DEV_BUILD=${{ matrix.dev-build }} NEW_DYNAREC=${{ matrix.new-dynarec }}
+      working-directory: ./src