Fix CI regressions

This addresses multiple CI failures related to Architecture tests and
SDL_MIXER installation across different platforms.

Author: jserv

.github/workflows/main.yml

@@ -283,7 +283,6 @@ jobs:
     - name: Architecture test
       env:
         CC: ${{ steps.install_cc.outputs.cc }}
-        LATEST_RELEASE: dummy
       run: |
             .ci/riscv-tests.sh
       if: ${{ always() }}
@@ -342,7 +341,8 @@ jobs:
      - uses: actions/checkout@v4
      - name: install-dependencies
        run: |
-             brew install make dtc expect sdl2 sdl2_mixer bc e2fsprogs p7zip llvm@18 dcfldd
+             brew install make dtc expect sdl2 bc e2fsprogs p7zip llvm@18 dcfldd
+             brew install sdl2_mixer || echo "Warning: sdl2_mixer installation failed, continuing without SDL_MIXER support"
              .ci/riscv-toolchain-install.sh
              echo "${{ github.workspace }}/toolchain/bin" >> $GITHUB_PATH
              echo "$(brew --prefix llvm@18)/bin" >> $GITHUB_PATH
@@ -489,7 +489,6 @@ jobs:
      - name: Architecture test
        env:
          CC: ${{ steps.install_cc.outputs.cc }}
-         LATEST_RELEASE: dummy
        run: |
              python3 -m venv venv
              . venv/bin/activate

Makefile

@@ -188,8 +188,7 @@ $(warning No sdl2-config in $$PATH. Check SDL2 installation in advance)
 override ENABLE_SDL := 0
 endif
 ifeq (1, $(shell pkg-config --exists SDL2_mixer; echo $$?))
-$(warning No SDL2_mixer lib installed. Check SDL2_mixer installation in advance)
-override ENABLE_SDL := 0
+$(warning No SDL2_mixer lib installed. SDL2_mixer support will be disabled)
 override ENABLE_SDL_MIXER := 0
 endif
 endif