Add Linux x64 CI

.github/workflows/ci.yml

@@ -18,8 +18,9 @@ jobs:
       matrix:
         platform:
           - { name: win-x64, os: ubuntu-20.04, flags: "--arch=x86_64 --target-os=mingw32 --cross-prefix=x86_64-w64-mingw32- --disable-w32threads --extra-ldflags=\"-static-libgcc -static-libstdc++ -static -s\"" }
+          - { name: linux-x64, os: ubuntu-20.04, flags: "--arch=x86_64 --extra-ldflags=\"-static-libgcc -static-libstdc++\"" }
     steps:
-      - name: Setup Linux dependencies
+      - name: Setup Linux common dependencies
         if: runner.os == 'Linux'
         run: |
           sudo apt-get install yasm                 \
@@ -29,9 +30,11 @@ jobs:
                                git                  \
                                pkg-config           \
                                libtool-bin          \
-                               nasm                 \
-                               gcc-mingw-w64-x86-64 \
-                               g++-mingw-w64-x86-64
+                               nasm
+      - name: Setup MinGW64 dependencies
+        if: ${{ matrix.platform.name == 'win-x64' }}
+        run: |
+          sudo apt-get install gcc-mingw-w64-x86-64 g++-mingw-w64-x86-64
       - uses: actions/checkout@v2
         with:
           repository: FFmpeg/FFmpeg