s390x assembly pack: remove chacha20 dependency on non-base memnonics
use strict;
use FindBin qw($Bin);
use lib "$Bin/../..";
-use perlasm::s390x qw(:DEFAULT :VX AUTOLOAD LABEL INCLUDE);
+use perlasm::s390x qw(:DEFAULT :VX :LD AUTOLOAD LABEL INCLUDE);
my $flavour = shift;
