[workflow] windows: use ninja/ffmpeg

.github/workflows/windows_test.yml

@@ -31,10 +31,11 @@ jobs:
             git
             mingw-w64-ucrt-x86_64-cmake
             mingw-w64-ucrt-x86_64-doctest
-            mingw-w64-ucrt-x86_64-openimageio
+            mingw-w64-ucrt-x86_64-ffmpeg
             mingw-w64-ucrt-x86_64-libunistring
             mingw-w64-ucrt-x86_64-ncurses
             mingw-w64-ucrt-x86_64-toolchain
+            mingw-w64-ucrt-x86_64-ninja
 
       - uses: actions/checkout@v2
 
@@ -53,12 +54,10 @@ jobs:
         run: |
           mkdir build && cd build
           cmake .. \
-            -G "MSYS Makefiles" \
+            -GNinja \
             -DCMAKE_BUILD_TYPE=Release \
             -DUSE_DOCTEST=off \
-            -DUSE_MULTIMEDIA=oiio \
             -DUSE_PANDOC=off \
-            -DUSE_READLINE=off \
             -DUSE_QRCODEGEN=on
 
       - name: make