remove_packages: remove a package's -debug package too

An AUR package built with makepkg's debug option comes with pkg-debug,
which nothing depends on, so pacman -Rns leaves it behind. voxtype-debug
then conflicts with voxtype-bin-debug, and update fails on machines
installed before voxtype-bin replaced voxtype. Found by
30-upgrade-from-baseline at 0c0ddf5.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

utils.sh

@@ -106,10 +106,16 @@ remove_packages() {
 
   # Match the exact name: pacman -Q also finds a package that provides it, such
   # as herdr-bin for herdr, which pacman -R won't remove by that name
+  # An AUR package built with makepkg's debug option comes with pkg-debug,
+  # which nothing depends on, so -Rns leaves it behind, and its files conflict
+  # with the replacement's (voxtype-debug with voxtype-bin-debug)
   for pkg in "${packages[@]}"; do
     if [ "$(pacman -Qq "$pkg" 2> /dev/null)" = "$pkg" ]; then
       to_remove+=("$pkg")
     fi
+    if [ "$(pacman -Qq "$pkg-debug" 2> /dev/null)" = "$pkg-debug" ]; then
+      to_remove+=("$pkg-debug")
+    fi
   done
 
   if [ ${#to_remove[@]} -ne 0 ]; then