binutils/binutils: drop redundant 'select'

No need to 'select' gold and plugins in versions later
than 2.21, since we inherit them with 2_21_or_later.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>

 #!/bin/sh

 set -e

 printf "Running autoconf...\n"

 autoconf -Wall --force

 printf "Done. You may now run:\n    ./configure\n"