unix_chkpwd is designed to have a suid bit, but it's not possible to set it
for files in the store.  This patch tells unix_pam.so to look for
unix_chkpwd in setuid program directory on Guix System.

--- a/modules/pam_unix/Makefile.in
+++ b/modules/pam_unix/Makefile.in
@@ -651,1 +651,1 @@
-	-DCHKPWD_HELPER=\"$(sbindir)/unix_chkpwd\" \
+	-DCHKPWD_HELPER=\"/run/setuid-programs/unix_chkpwd\" \
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<tr><td><span title='2023-10-14 22:41:44 +0200'>2023-10-14</span></td><td><a href='/guix/commit/gnu/packages/vim.scm?id=63d2241ff950f2c2e9bd371b3ee0c40958946adb'>gnu: Add vim-rainbow</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/vim.scm (vim-rainbow): New variable.

Signed-off-by: Ludovic Courtès &lt;ludo@gnu.org&gt;
</span></span></td><td>mason1920</td></tr>
<tr><td><span title='2023-10-08 10:19:08 +0300'>2023-10-08</span></td><td><a href='/guix/commit/gnu/packages/vim.scm?id=9b77bd0b9b4f3de69390da0ba7db5b9dbc01e554'>gnu: vim: Update to 9.0.2001.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/vim.scm (vim): Update to 9.0.2001.
[arguments]: Skip another test.
</span></span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2023-09-08 01:26:01 -0500'>2023-09-08</span></td><td><a href='/guix/commit/gnu/packages/vim.scm?id=c6ac52e8e6aa6e77ac0824b378904b8269adc789'>gnu: Add vim-vlime.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/vim.scm (vim-vlime): New variable.

Signed-off-by: jgart &lt;jgart@dismail.de&gt;
</span></span></td><td>Charles Jackson</td></tr>