configure: always pick /usr/bin/passwd

Improve reproducibility, without Build-Depend:ing on ourselves.

Thanks: Jochen Sprickerhof <jspricke@debian.org>

debian/patches/debian/configure-always-pick-usr-bin-passwd.patch

@@ -0,0 +1,28 @@
+From: Chris Hofstaedtler <zeha@debian.org>
+Date: Mon, 24 Feb 2025 12:01:18 +0100
+Subject: configure: always pick /usr/bin/passwd
+
+Improve reproducibility, without Build-Depend:ing on ourselves.
+---
+ configure.ac | 8 +-------
+ 1 file changed, 1 insertion(+), 7 deletions(-)
+
+diff --git a/configure.ac b/configure.ac
+index a7388e7..2a6591a 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -150,13 +150,7 @@ AC_DEFINE_UNQUOTED(LASTLOG_FILE, "$shadow_cv_logdir/lastlog",
+ AC_DEFINE_UNQUOTED(FAILLOG_FILE, "$shadow_cv_logdir/faillog",
+ 	[Path for faillog file.])
+ 
+-AC_CACHE_CHECK([location of the passwd program], shadow_cv_passwd_dir,
+-[if test -f /usr/bin/passwd; then
+-	shadow_cv_passwd_dir=/usr/bin
+-else
+-	shadow_cv_passwd_dir=/bin
+-fi])
+-AC_DEFINE_UNQUOTED(PASSWD_PROGRAM, "$shadow_cv_passwd_dir/passwd",
++AC_DEFINE_UNQUOTED(PASSWD_PROGRAM, "$prefix/bin/passwd",
+ 	[Path to passwd program.])
+ 
+ AC_ARG_ENABLE(shadowgrp,

debian/patches/series

@@ -6,6 +6,7 @@ debian/tests-disable-su.patch
 debian/Adapt-login.defs-for-Debian.patch
 debian/Define-LOGIN_NAME_MAX-on-HURD.patch
 debian/Stop-building-programs-we-do-not-install.patch
+debian/configure-always-pick-usr-bin-passwd.patch
 upstream/a015e919834c90b99947829c6c823f7fe93a8097-E_BAD_NAME.patch
 upstream/man-useradd.8.xml-Document-new-exit-code-19-E_BAD_NAME.patch
 upstream/Revert-lib-src-Use-local-time-for-human-readable-dates.patch