Update the autoconf dependency to 2.64 (from 2.53) because of PACKAGE_URL. (dm)
Update the autoconf dependency to 2.64 (from 2.53) because of PACKAGE_URL. (dm)

brltty/brltty,brltty/brltty,brltty/brltty,brltty/brltty,brltty/brltty,brltty/brltty