systemd: add patch for PAM enable

the pam_systemd library wasn't compiling due to logind dependencies and
shared library issues.

resolves openbmc/openbmc#619

Change-Id: I2e152c6e989025d28051008ebd032d8e696cfe68
Signed-off-by: Edward A. James <eajames@us.ibm.com>
diff --git a/common/recipes-core/systemd/systemd_%.bbappend b/common/recipes-core/systemd/systemd_%.bbappend
index feaeaf9..a93de86 100644
--- a/common/recipes-core/systemd/systemd_%.bbappend
+++ b/common/recipes-core/systemd/systemd_%.bbappend
@@ -7,6 +7,7 @@
 FILESEXTRAPATHS_append := "${THISDIR}/${PN}:"
 SRC_URI += "file://default.network"
 SRC_URI += "file://0001-Export-message_append_cmdline.patch"
+SRC_URI += "file://0002-systemd-Make-pam-compile-shared-library.patch"
 
 RRECOMMENDS_${PN} += "obmc-targets"
 FILES_${PN} += "${libdir}/systemd/network/default.network"