remove build folder when deciding to skip build

configure.sh

@@ -15,6 +15,9 @@ if [[ -f "$existing_as" ]]; then
   existing_version=$($existing_as --version | head -n 1 | grep -Eo '[0-9.]+$')
   if [[ $existing_version == $VERSION ]]; then
     echo "$TAG Version $VERSION already installed, skipping rebuild"
+    if [[ -e build ]]; then
+      rm -rf build
+    fi
     exit 0
   fi
 fi