Install both bash and zsh shell completions.

--- a/configure
+++ b/configure
@@ -59,8 +59,8 @@ if ( $opt_shell and -f $opt_shell and $opt_shell =~ /^\// ) {
 # gererate Makefile
 my @bad = ();
 my $shell = check_shell_vers();
-my $no_bash = (grep {/bash/} @bad);
-my $no_zsh = (grep {/zsh/} @bad);
+my $no_bash = 0;
+my $no_zsh = 0;
 
 if ( ! $opt_nomake ) {
 	open OUT, ">Makefile";