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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<div class='path'>path: <a href='/guix/log/?id=d78ca1cbb17e35fa935a9030bf8e214407b6b4ce'>root</a>/<a href='/guix/log/gnu?id=d78ca1cbb17e35fa935a9030bf8e214407b6b4ce'>gnu</a>/<a href='/guix/log/gnu/packages?id=d78ca1cbb17e35fa935a9030bf8e214407b6b4ce'>packages</a>/<a href='/guix/log/gnu/packages/aux-files?id=d78ca1cbb17e35fa935a9030bf8e214407b6b4ce'>aux-files</a>/<a href='/guix/log/gnu/packages/aux-files/linux-libre?id=d78ca1cbb17e35fa935a9030bf8e214407b6b4ce'>linux-libre</a>/<a href='/guix/log/gnu/packages/aux-files/linux-libre/5.4-arm.conf?id=d78ca1cbb17e35fa935a9030bf8e214407b6b4ce'>5.4-arm.conf</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/packages/aux-files/linux-libre/5.4-arm.conf?id=d78ca1cbb17e35fa935a9030bf8e214407b6b4ce&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2021-07-15 01:54:26 -0400'>2021-07-15</span></td><td><a href='/guix/commit/gnu/packages/aux-files/linux-libre/5.4-arm.conf?id=12763e4d3a90d113da85f5c9d116889982021a8f'>gnu: linux-libre: Default to the 'schedutil' CPU scaling governor.</a><span class='msg-avail'>...<span class='msg-tooltip'>For more information about these configuration options, read
&lt;https://www.kernel.org/doc/Documentation/cpu-freq/governors.txt&gt; or the
document 'Documentation/admin-guide/pm/cpufreq.rst' in the linux-libre
source distribution.

* gnu/packages/aux-files/linux-libre/4.14-arm.conf,
gnu/packages/aux-files/linux-libre/4.14-i686.conf,
gnu/packages/aux-files/linux-libre/4.14-x86_64.conf,
gnu/packages/aux-files/linux-libre/4.19-arm.conf,
gnu/packages/aux-files/linux-libre/4.19-arm64.conf,
gnu/packages/aux-files/linux-libre/4.19-i686.conf,
gnu/packages/aux-files/linux-libre/4.19-x86_64.conf,
gnu/packages/aux-files/linux-libre/4.9-i686.conf,
gnu/packages/aux-files/linux-libre/4.9-x86_64.conf,
gnu/packages/aux-files/linux-libre/5.10-i686.conf,
gnu/packages/aux-files/linux-libre/5.10-x86_64.conf,
gnu/packages/aux-files/linux-libre/5.12-i686.conf,
gnu/packages/aux-files/linux-libre/5.12-x86_64.conf,
gnu/packages/aux-files/linux-libre/5.13-i686.conf,
gnu/packages/aux-files/linux-libre/5.13-x86_64.conf,
gnu/packages/aux-files/linux-libre/5.4-arm.conf,
gnu/packages/aux-files/linux-libre/5.4-arm64.conf,
gnu/packages/aux-files/linux-libre/5.4-i686.conf,
gnu/packages/aux-files/linux-libre/5.4-x86_64.conf: Unset
'CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE' and set
'CONFIG_CPU_FREQ_DEFAULT_GOV_SCHEDUTIL=y'.
</span></span></td><td>Leo Famulari</td></tr>
<tr><td><span title='2020-10-15 14:23:01 -0400'>2020-10-15</span></td><td><a href='/guix/commit/gnu/packages/aux-files/linux-libre/5.4-arm.conf?id=f43287aff06082c83649a1d0c0184b9ac347c3c8'>gnu: linux-libre: Enable XDP sockets and their monitoring.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/aux-files/linux-libre/4.19-arm.conf: Enable AF_XDP
sockets and the associated monitor interface.
* gnu/packages/aux-files/linux-libre/4.19-arm64.conf: Likewise
* gnu/packages/aux-files/linux-libre/4.19-i686.conf: Likewise
* gnu/packages/aux-files/linux-libre/4.19-x86_64.conf: Likewise
* gnu/packages/aux-files/linux-libre/5.4-arm.conf: Likewise
* gnu/packages/aux-files/linux-libre/5.4-arm64.conf: Likewise
* gnu/packages/aux-files/linux-libre/5.4-i686.conf: Likewise
* gnu/packages/aux-files/linux-libre/5.4-x86_64.conf: Likewise
* gnu/packages/aux-files/linux-libre/5.8-arm.conf: Likewise
* gnu/packages/aux-files/linux-libre/5.8-arm64.conf: Likewise
* gnu/packages/aux-files/linux-libre/5.8-i686.conf: Likewise
* gnu/packages/aux-files/linux-libre/5.8-x86_64.conf: Likewise
</span></span></td><td>Tobias Geerinckx-Rice via Guix-patches via</td></tr>