undo of cmakelist changes, using AUR instead to resolve cava build requirement

ci/Dockerfile

@@ -25,5 +25,19 @@ RUN pacman -S --noconfirm \
     libqalculate \
     pipewire \
     aubio \
+    cava \
     lm_sensors \
     glib2
+
+# AUR: libcava (provides development headers for cava)
+RUN pacman -S --needed --noconfirm sudo && \
+    useradd -m builder && \
+    echo "builder ALL=(ALL) NOPASSWD: ALL" >> /etc/sudoers && \
+    su builder -c " \
+        git clone https://aur.archlinux.org/libcava.git /tmp/libcava && \
+        cd /tmp/libcava && \
+        makepkg -si --noconfirm \
+    " && \
+    rm -rf /tmp/libcava && \
+    userdel -r builder && \
+    sed -i '/^builder/d' /etc/sudoers