chore(build): exclude broken symlinks in find-apps.sh

scripts/find-apps.sh

@@ -20,4 +20,4 @@ fi
 ## find directories in lib-extra
 find_app 'lib-extra'
 ## find symlinks in lib-extra
-find 'lib-extra/' -mindepth 1 -maxdepth 1 -type l
+find 'lib-extra/' -mindepth 1 -maxdepth 1 -type l -exec test -e {} \; -print