systemd: fix systemd-user pam configuration file.

srcpkgs/systemd/template

@@ -1,7 +1,7 @@
 # Template file for 'systemd'
 pkgname=systemd
 version=207
-revision=1
+revision=2
 short_desc="A system and service manager for Linux"
 maintainer="Juan RP <xtraeme@gmail.com>"
 homepage="http://www.freedesktop.org/wiki/Software/systemd"
@@ -120,6 +120,9 @@ post_install() {
 	# fix .so links in manpage stubs
 	find ${DESTDIR}/usr/share/man -type f -name '*.[[:digit:]]' \
 		-exec sed -ri '1s|^\.so (.*)\.([0-9]+)|.so man\2/\1.\2|' {} +
+
+	# XXX We don't have pam.d/system-auth, use login pam service instead.
+	sed -e 's,system-auth,login,g' -i ${DESTDIR}/etc/pam.d/systemd-user
 }
 
 if [ -z "$CROSS_BUILD" ]; then