Bash: apply patches 12 through 18 as well

Bash: apply patches 12 through 18 as well

Those fix some unintentional behaviour regarding autocompletion I
stumbled across the other day. While there seems nothing security
relevant in this, it irons out a few bugs.

The full and up-to-date list of all Bash 5.0 patches can be obtained
from https://ftp.gnu.org/gnu/bash/bash-5.0-patches/ .

Signed-off-by: Peter Müller <peter.mueller@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>