Add elogind support

pkg.info

@@ -1,7 +1,7 @@
 name: pam
 description: Pluggable Authentication Modules for Linux
 version: 1.6.0
-revision: 3
+revision: 4
 url: https://github.com/linux-pam/linux-pam
 license: GPL2-or-later
 architecture: any

source-files/system-session

@@ -1 +1,3 @@
 session   required    pam_unix.so
+session   required    pam_loginuid.so
+-session  optional    pam_elogind.so