Try the macOS universal build

.appveyor.yml

@@ -3,8 +3,8 @@ configuration: Release
 
 environment:
   matrix:
-  - job_name: macOS Mojave
-    appveyor_build_worker_image: macos-mojave
+  - job_name: macOS
+    appveyor_build_worker_image: macos
     INSTALL_DIR: sfizz-$(APPVEYOR_REPO_TAG_NAME)-macos
 
   - job_name: Windows x86
@@ -31,11 +31,12 @@ environment:
 for:
 - matrix:
     only:
-    - job_name: macOS Mojave
+    - job_name: macOS
   init:
   - system_profiler SPSoftwareDataType
   - cmake --version
   - gcc -v
+  - xcodebuild -version
   install:
   - chmod +x ${APPVEYOR_BUILD_FOLDER}/scripts/appveyor/install.sh
   - ${APPVEYOR_BUILD_FOLDER}/scripts/appveyor/install.sh

scripts/appveyor/before_build.sh

@@ -4,6 +4,7 @@ set -ex
 git submodule update --init --recursive
 mkdir -p build/${INSTALL_DIR} && cd build
 cmake -DCMAKE_BUILD_TYPE=Release \
+      -DCMAKE_OSX_ARCHITECTURES="arm64;x86_64" \
       -DSFIZZ_VST=ON \
       -DSFIZZ_AU=ON \
       -DSFIZZ_RENDER=OFF \