Add dwz for debhelper

[Samuel Thibault <sthibault@debian.org>]

Hello,

Nowadays, debhelper pulls dwz, so we'd want to crossbuild it.
Here is a fix, also available in my tree

git@salsa.debian.org:sthibault/rebootstrap.git

as 743426b1da145a760c9139617bb5e86281e3590c

Samuel

commit 743426b1da145a760c9139617bb5e86281e3590c
Author: Samuel Thibault <samuel.thibault@ens-lyon.org>
Date:   Fri Jul 11 10:07:44 2025 +0200

    Add dwz for debhelper
    
    Nowadays debhelper pulls it.

diff --git a/bootstrap.sh b/bootstrap.sh
index db97577..749fbd1 100755
--- a/bootstrap.sh
+++ b/bootstrap.sh
@@ -845,6 +845,7 @@ buildenv_diffutils() {
 }
 
 add_automatic dpkg
+add_automatic dwz
 add_automatic e2fsprogs
 add_automatic expat
 add_automatic file
@@ -4048,6 +4049,7 @@ add_need blt # by pythonX.Y
 add_need bsdmainutils # for man-db
 add_need bzip2 # by gnupg2, perl
 add_need db-defaults # by perl, python3.X
+add_need dwz # for debhelper
 add_need expat # by unbound
 add_need file # by gcc-6, for debhelper
 add_need flex # by pam