bootstrap: Remove obsolete code. Reported by Basil L. Contovounesios <basil@contovou.net> in <https://lists.gnu.org/archive/html/bug-gnulib/2025-01/msg00221.html>. * top/bootstrap-funclib.sh (package): Don't look at gl_INIT_PACKAGE invocations. * build-aux/bootstrap: Regenerated.