Morse Decoder: disable Windows build

.github/workflows/sdrangel.yml

@@ -81,7 +81,7 @@ jobs:
           cmd "C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\VC\Auxiliary\Build\vcvars64.bat"
           choco install patch
           mkdir build && cd build
-          cmake .. -G "${{ matrix.config.generators }}" -DCMAKE_BUILD_TYPE=Release -DARCH_OPT=SSE4_2 -DDEBUG_OUTPUT=ON -DENABLE_MIRISDR=OFF -DBUILD_SERVER=OFF -DCMAKE_PREFIX_PATH="C:\Qt\5.15.2\msvc2019_64;C:\Libraries\boost_1_73_0"
+          cmake .. -G "${{ matrix.config.generators }}" -DCMAKE_BUILD_TYPE=Release -DARCH_OPT=SSE4_2 -DDEBUG_OUTPUT=ON -DENABLE_MIRISDR=OFF -DENABLE_FEATURE_MORSEDECODER=OFF -DBUILD_SERVER=OFF -DCMAKE_PREFIX_PATH="C:\Qt\5.15.2\msvc2019_64;C:\Libraries\boost_1_73_0"
           cmake --build . --config Release --target package
       - name: Check disk space
         run: Get-PSDrive