CI: get rid of system lib compilation

.github/workflows/build.yml

@@ -150,57 +150,6 @@ jobs:
           libjack-jackd2-dev:armhf
         ls /usr/arm-linux-gnueabihf/lib
 
-    - name: Configure (System Libraries)
-      if: ${{ runner.os == 'Linux' && matrix.config.compiler != 'mingw' && matrix.config.arch == 'x86_64' }}
-      run: |
-        export USE_WAE=ON
-        export CMAKE_EXTRA_ARGS=()
-        if [ '${{ matrix.config.compiler }}' == 'msvc' ]; then
-          CMAKE_EXTRA_ARGS+=('-DCMAKE_GENERATOR_PLATFORM=${{ steps.windows-identify.outputs.msvc-target }}')
-        elif [ '${{ matrix.config.compiler }}' == 'mingw' ]; then
-          CMAKE_EXTRA_ARGS+=('-DCMAKE_TOOLCHAIN_FILE=scripts/Cross-MinGW-${{ steps.windows-identify.outputs.mingw-target }}.cmake')
-        else
-          # Test with system libs
-          CMAKE_EXTRA_ARGS+=(
-            '-DSYSTEM_FMT=OFF'
-            '-DSYSTEM_LIBSNDFILE=ON'
-            '-DSYSTEM_RTMIDI=ON'
-            '-DSYSTEM_ZLIB=ON'
-            '-DWITH_JACK=ON'
-          )
-          # Too old on Ubuntu
-          if [ '${{ runner.os }}' == 'macOS' ]; then
-            CMAKE_EXTRA_ARGS+=('-DSYSTEM_SDL2=ON')
-          fi
-        fi
-
-        cmake \
-          -B ${PWD}/build \
-          -DCMAKE_INSTALL_PREFIX=${PWD}/target \
-          -DCMAKE_BUILD_TYPE=${{ env.BUILD_TYPE }} \
-          -DWARNINGS_ARE_ERRORS=${USE_WAE} \
-          "${CMAKE_EXTRA_ARGS[@]}"
-
-    - name: Build (System Libraries)
-      if: ${{ runner.os == 'Linux' && matrix.config.compiler != 'mingw' && matrix.config.arch == 'x86_64' }}
-      run: |
-        cmake \
-          --build ${PWD}/build \
-          --config ${{ env.BUILD_TYPE }} \
-          --parallel ${{ steps.build-cores.outputs.amount }}
-
-    - name: Install (System Libraries)
-      if: ${{ runner.os == 'Linux' && matrix.config.compiler != 'mingw' && matrix.config.arch == 'x86_64' }}
-      run: |
-        cmake \
-          --install ${PWD}/build \
-          --config ${{ env.BUILD_TYPE }}
-
-    - name: Cleanup (System Libraries)
-      if: ${{ runner.os == 'Linux' && matrix.config.compiler != 'mingw' && matrix.config.arch == 'x86_64' }}
-      run: |
-        rm -rf build/ target/
-
     - name: Configure
       run: |
         export USE_WAE=ON