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='content'><div id='summary'><pre>
Skip &apos;test-stack-overflow&apos; that crashes when using QEMU transparent emulation.

--- a/test-suite/standalone/Makefile.in	1970-01-01 01:00:01.000000000 +0100
+++ b/test-suite/standalone/Makefile.in	2021-01-11 10:59:31.606269449 +0100
@@ -102,8 +102,7 @@
 	test-scm-to-latin1-string$(EXEEXT) test-scm-values$(EXEEXT) \
 	test-scm-c-bind-keyword-arguments$(EXEEXT) \
 	test-srfi-4$(EXEEXT) $(am__append_6) $(am__EXEEXT_1) \
-	test-smob-mark$(EXEEXT) test-smob-mark-race$(EXEEXT) \
-	test-stack-overflow
+	test-smob-mark$(EXEEXT) test-smob-mark-race$(EXEEXT)
 check_PROGRAMS = test-num2integral$(EXEEXT) test-round$(EXEEXT) \
 	test-foreign-object-c$(EXEEXT) test-list$(EXEEXT) \
 	test-unwind$(EXEEXT) test-conversion$(EXEEXT) \
@@ -1938,7 +1937,7 @@
 	test-command-line-encoding test-command-line-encoding2 \
 	test-language test-guild-compile $(am__append_3) \
 	test-foreign-object-scm test-fast-slot-ref test-mb-regexp \
-	test-use-srfi $(am__append_5) test-stack-overflow
+	test-use-srfi $(am__append_5)
 BUILT_SOURCES = $(am__append_2)
 EXTRA_DIST = test-import-order-a.scm test-import-order-b.scm \
 	test-import-order-c.scm test-import-order-d.scm \
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