cex: add gnulib dependencies

* bootstrap.conf (gnulib_modules): Add linked-list.

bootstrap.conf

@@ -30,6 +30,7 @@ gnulib_modules='
   javaexec-script
   ldexpl
   libtextstyle-optional
+  linked-list
   malloc-gnu
   mbfile mbswidth
   non-recursive-gnulib-prefix-hack
@@ -37,6 +38,7 @@ gnulib_modules='
   obstack-printf
   perror progname
   quote quotearg
+  rbtreehash-list
   readline
   readme-release
   realloc-posix